diff --git a/api/system-current.txt b/api/system-current.txt
index d84b1dc..c6d7364 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -5327,6 +5327,7 @@
 
   public class WallpaperManager {
     method public void clear() throws java.io.IOException;
+    method public void clearWallpaper();
     method public void clearWallpaperOffsets(android.os.IBinder);
     method public void forgetLoadedWallpaper();
     method public android.graphics.drawable.Drawable getBuiltInDrawable();
@@ -5347,6 +5348,7 @@
     method public void setDisplayPadding(android.graphics.Rect);
     method public void setResource(int) throws java.io.IOException;
     method public void setStream(java.io.InputStream) throws java.io.IOException;
+    method public boolean setWallpaperComponent(android.content.ComponentName);
     method public void setWallpaperOffsetSteps(float, float);
     method public void setWallpaperOffsets(android.os.IBinder, float, float);
     method public void suggestDesiredDimensions(int, int);
@@ -26872,6 +26874,7 @@
     field public static final java.lang.String SHOW_PROCESSES = "show_processes";
     field public static final java.lang.String STAY_ON_WHILE_PLUGGED_IN = "stay_on_while_plugged_in";
     field public static final java.lang.String SYS_PROP_SETTING_VERSION = "sys.settings_global_version";
+    field public static final java.lang.String THEATER_MODE_ON = "theater_mode_on";
     field public static final java.lang.String TRANSITION_ANIMATION_SCALE = "transition_animation_scale";
     field public static final java.lang.String USB_MASS_STORAGE_ENABLED = "usb_mass_storage_enabled";
     field public static final java.lang.String USE_GOOGLE_MAIL = "use_google_mail";
@@ -36910,8 +36913,10 @@
     method public java.lang.String debug(java.lang.String);
     method public int describeContents();
     method public final java.lang.CharSequence getTitle();
+    method public final long getUserActivityTimeout();
     method public static boolean mayUseInputMethod(int);
     method public final void setTitle(java.lang.CharSequence);
+    method public final void setUserActivityTimeout(long);
     method public void writeToParcel(android.os.Parcel, int);
     field public static final int ALPHA_CHANGED = 128; // 0x80
     field public static final int ANIMATION_CHANGED = 16; // 0x10
diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index 8bfe6d3..90d84ee 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -994,6 +994,47 @@
     }
 
     /**
+     * Clear the wallpaper.
+     *
+     * @hide
+     */
+    @SystemApi
+    public void clearWallpaper() {
+        if (sGlobals.mService == null) {
+            Log.w(TAG, "WallpaperService not running");
+            return;
+        }
+        try {
+            sGlobals.mService.clearWallpaper();
+        } catch (RemoteException e) {
+            // Ignore
+        }
+    }
+
+    /**
+     * Set the live wallpaper.
+     *
+     * This can only be called by packages with android.permission.SET_WALLPAPER_COMPONENT
+     * permission.
+     *
+     * @hide
+     */
+    @SystemApi
+    public boolean setWallpaperComponent(ComponentName name) {
+        if (sGlobals.mService == null) {
+            Log.w(TAG, "WallpaperService not running");
+            return false;
+        }
+        try {
+            sGlobals.mService.setWallpaperComponent(name);
+            return true;
+        } catch (RemoteException e) {
+            // Ignore
+        }
+        return false;
+    }
+
+    /**
      * Set the position of the current wallpaper within any larger space, when
      * that wallpaper is visible behind the given window.  The X and Y offsets
      * are floating point numbers ranging from 0 to 1, representing where the
diff --git a/core/java/android/os/PowerManager.java b/core/java/android/os/PowerManager.java
index 8307d9b..d52dd30 100644
--- a/core/java/android/os/PowerManager.java
+++ b/core/java/android/os/PowerManager.java
@@ -835,6 +835,21 @@
     }
 
     /**
+     * Turn off the device.
+     *
+     * @param confirm If true, shows a shutdown confirmation dialog.
+     * @param wait If true, this call waits for the shutdown to complete and does not return.
+     *
+     * @hide
+     */
+    public void shutdown(boolean confirm, boolean wait) {
+        try {
+            mService.shutdown(confirm, wait);
+        } catch (RemoteException e) {
+        }
+    }
+
+    /**
      * Intent that is broadcast when the state of {@link #isPowerSaveMode()} changes.
      * This broadcast is only sent to registered receivers.
      */
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 838686a..92349338 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -5101,6 +5101,7 @@
          * Whether Theater Mode is on.
          * {@hide}
          */
+        @SystemApi
         public static final String THEATER_MODE_ON = "theater_mode_on";
 
         /**
diff --git a/core/java/android/view/WindowManager.java b/core/java/android/view/WindowManager.java
index 094a8a1..84434f7 100644
--- a/core/java/android/view/WindowManager.java
+++ b/core/java/android/view/WindowManager.java
@@ -16,6 +16,7 @@
 
 package android.view;
 
+import android.annotation.SystemApi;
 import android.app.Presentation;
 import android.content.Context;
 import android.content.pm.ActivityInfo;
@@ -1590,7 +1591,19 @@
         public final CharSequence getTitle() {
             return mTitle;
         }
-    
+
+        /** @hide */
+        @SystemApi
+        public final void setUserActivityTimeout(long timeout) {
+            userActivityTimeout = timeout;
+        }
+
+        /** @hide */
+        @SystemApi
+        public final long getUserActivityTimeout() {
+            return userActivityTimeout;
+        }
+
         public int describeContents() {
             return 0;
         }
diff --git a/core/java/android/view/WindowManagerPolicy.java b/core/java/android/view/WindowManagerPolicy.java
index b8e94ee..780ca99 100644
--- a/core/java/android/view/WindowManagerPolicy.java
+++ b/core/java/android/view/WindowManagerPolicy.java
@@ -17,6 +17,7 @@
 package android.view;
 
 import android.annotation.IntDef;
+import android.annotation.SystemApi;
 import android.content.Context;
 import android.content.pm.ActivityInfo;
 import android.content.res.CompatibilityInfo;
@@ -105,6 +106,13 @@
     public final static String EXTRA_HDMI_PLUGGED_STATE = "state";
 
     /**
+     * Set to {@code true} when intent was invoked from pressing the home key.
+     * @hide
+     */
+    @SystemApi
+    public static final String EXTRA_FROM_HOME_KEY = "android.intent.extra.FROM_HOME_KEY";
+
+    /**
      * Pass this event to the user / app.  To be returned from
      * {@link #interceptKeyBeforeQueueing}.
      */
diff --git a/core/res/res/values-watch/config.xml b/core/res/res/values-watch/config.xml
index 3eede32..307a1ea 100644
--- a/core/res/res/values-watch/config.xml
+++ b/core/res/res/values-watch/config.xml
@@ -23,7 +23,7 @@
 
     <!-- Only show settings item due to smaller real estate. -->
     <string-array translatable="false" name="config_globalActionsList">
-        <item>settings</item>
+        <item>voiceassist</item>
     </string-array>
 
     <!-- Base "touch slop" value used by ViewConfiguration as a
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 20b4b62..d30d36e 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -482,6 +482,9 @@
     <!-- label for item that launches settings in phone options dialog [CHAR LIMIT=15]-->
     <string name="global_action_settings">Settings</string>
 
+    <!-- label for item that launches voice assist in phone options dialog [CHAR LIMIT=15]-->
+    <string name="global_action_voice_assist">Voice Assist</string>
+
     <!-- label for item that locks the phone and enforces that it can't be unlocked without entering a credential. [CHAR LIMIT=15] -->
     <string name="global_action_lockdown">Lock now</string>
 
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 1055547..77c981a9 100755
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -1527,6 +1527,7 @@
   <java-symbol type="string" name="global_action_silent_mode_on_status" />
   <java-symbol type="string" name="global_action_toggle_silent_mode" />
   <java-symbol type="string" name="global_action_lockdown" />
+  <java-symbol type="string" name="global_action_voice_assist" />
   <java-symbol type="string" name="invalidPuk" />
   <java-symbol type="string" name="lockscreen_carrier_default" />
   <java-symbol type="style" name="Animation.LockScreen" />
@@ -1614,6 +1615,7 @@
   <java-symbol type="drawable" name="ic_notification_ime_default" />
   <java-symbol type="drawable" name="ic_menu_refresh" />
   <java-symbol type="drawable" name="ic_settings" />
+  <java-symbol type="drawable" name="ic_voice_search" />
   <java-symbol type="drawable" name="stat_notify_car_mode" />
   <java-symbol type="drawable" name="stat_notify_disabled_data" />
   <java-symbol type="drawable" name="stat_notify_disk_full" />
diff --git a/policy/src/com/android/internal/policy/impl/GlobalActions.java b/policy/src/com/android/internal/policy/impl/GlobalActions.java
index b0b2886..20a2c9f 100644
--- a/policy/src/com/android/internal/policy/impl/GlobalActions.java
+++ b/policy/src/com/android/internal/policy/impl/GlobalActions.java
@@ -100,6 +100,7 @@
     private static final String GLOBAL_ACTION_KEY_USERS = "users";
     private static final String GLOBAL_ACTION_KEY_SETTINGS = "settings";
     private static final String GLOBAL_ACTION_KEY_LOCKDOWN = "lockdown";
+    private static final String GLOBAL_ACTION_KEY_VOICEASSIST = "voiceassist";
 
     private final Context mContext;
     private final WindowManagerFuncs mWindowManagerFuncs;
@@ -291,6 +292,8 @@
                 mItems.add(getSettingsAction());
             } else if (GLOBAL_ACTION_KEY_LOCKDOWN.equals(actionKey)) {
                 mItems.add(getLockdownAction());
+            } else if (GLOBAL_ACTION_KEY_VOICEASSIST.equals(actionKey)) {
+                mItems.add(getVoiceAssistAction());
             } else {
                 Log.e(TAG, "Invalid global action key " + actionKey);
             }
@@ -436,6 +439,28 @@
         };
     }
 
+    private Action getVoiceAssistAction() {
+        return new SinglePressAction(com.android.internal.R.drawable.ic_voice_search,
+                R.string.global_action_voice_assist) {
+            @Override
+            public void onPress() {
+                Intent intent = new Intent(Intent.ACTION_VOICE_ASSIST);
+                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
+                mContext.startActivity(intent);
+            }
+
+            @Override
+            public boolean showDuringKeyguard() {
+                return true;
+            }
+
+            @Override
+            public boolean showBeforeProvisioning() {
+                return true;
+            }
+        };
+    }
+
     private Action getLockdownAction() {
         return new SinglePressAction(com.android.internal.R.drawable.ic_lock_lock,
                 R.string.global_action_lockdown) {
diff --git a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
index 345520a..b9dba81 100644
--- a/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
+++ b/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
@@ -153,6 +153,7 @@
     static final int SHORT_PRESS_POWER_GO_TO_SLEEP = 1;
     static final int SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP = 2;
     static final int SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP_AND_GO_HOME = 3;
+    static final int SHORT_PRESS_POWER_GO_HOME = 4;
 
     static final int LONG_PRESS_POWER_NOTHING = 0;
     static final int LONG_PRESS_POWER_GLOBAL_ACTIONS = 1;
@@ -971,6 +972,9 @@
                             PowerManager.GO_TO_SLEEP_FLAG_NO_DOZE);
                     launchHomeFromHotKey();
                     break;
+                case SHORT_PRESS_POWER_GO_HOME:
+                    launchHomeFromHotKey();
+                    break;
             }
         }
     }
@@ -2991,7 +2995,7 @@
                         } catch (RemoteException e) {
                         }
                         sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY);
-                        startDockOrHome();
+                        startDockOrHome(true /*fromHomeKey*/);
                     }
                 }
             });
@@ -3009,7 +3013,7 @@
             } else {
                 // Otherwise, just launch Home
                 sendCloseSystemWindows(SYSTEM_DIALOG_REASON_HOME_KEY);
-                startDockOrHome();
+                startDockOrHome(true /*fromHomeKey*/);
             }
         }
     }
@@ -5821,19 +5825,31 @@
         return null;
     }
 
-    void startDockOrHome() {
+    void startDockOrHome(boolean fromHomeKey) {
         awakenDreams();
 
         Intent dock = createHomeDockIntent();
         if (dock != null) {
             try {
+                if (fromHomeKey) {
+                    dock.putExtra(WindowManagerPolicy.EXTRA_FROM_HOME_KEY, fromHomeKey);
+                }
                 mContext.startActivityAsUser(dock, UserHandle.CURRENT);
                 return;
             } catch (ActivityNotFoundException e) {
             }
         }
 
-        mContext.startActivityAsUser(mHomeIntent, UserHandle.CURRENT);
+        Intent intent;
+
+        if (fromHomeKey) {
+            intent = new Intent(mHomeIntent);
+            intent.putExtra(WindowManagerPolicy.EXTRA_FROM_HOME_KEY, fromHomeKey);
+        } else {
+            intent = mHomeIntent;
+        }
+
+        mContext.startActivityAsUser(intent, UserHandle.CURRENT);
     }
 
     /**
@@ -5848,7 +5864,7 @@
             } catch (RemoteException e) {
             }
             sendCloseSystemWindows();
-            startDockOrHome();
+            startDockOrHome(false /*fromHomeKey*/);
         } else {
             // This code brings home to the front or, if it is already
             // at the front, puts the device to sleep.