Initial KeySet API.

Previously submitted but reverted due to doc-compilation bug.

Bug: 6967056
Change-Id: I9bd7ef299a4c92c4b327f5b5d7e951f0753b4c8a
diff --git a/test-runner/src/android/test/mock/MockPackageManager.java b/test-runner/src/android/test/mock/MockPackageManager.java
index a14714a..648c418 100644
--- a/test-runner/src/android/test/mock/MockPackageManager.java
+++ b/test-runner/src/android/test/mock/MockPackageManager.java
@@ -31,6 +31,7 @@
 import android.content.pm.IPackageMoveObserver;
 import android.content.pm.IPackageStatsObserver;
 import android.content.pm.InstrumentationInfo;
+import android.content.pm.KeySet;
 import android.content.pm.ManifestDigest;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageInstaller;
@@ -616,6 +617,26 @@
         throw new UnsupportedOperationException();
     }
 
+    @Override
+    public KeySet getKeySetByAlias(String packageName, String alias) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public KeySet getSigningKeySet(String packageName) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean isSignedBy(String packageName, KeySet ks) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public boolean isSignedByExactly(String packageName, KeySet ks) {
+        throw new UnsupportedOperationException();
+    }
+
     /**
      * @hide
      */