Add KEY_USE_RCS_PRESENCE_BOOL carrier config option.

- New carrier config option is used to determine if presence is used
to determine whether a contact is capable of video calling.
- Also, improve logging for PhoneAccount capabilities.

Bug: 20257833
Change-Id: Ifcc7df95677eb4399f08eb8849c4004892957e90
diff --git a/telecomm/java/android/telecom/PhoneAccount.java b/telecomm/java/android/telecom/PhoneAccount.java
index b18af33..b56ce73 100644
--- a/telecomm/java/android/telecom/PhoneAccount.java
+++ b/telecomm/java/android/telecom/PhoneAccount.java
@@ -687,7 +687,7 @@
                 .append("] PhoneAccount: ")
                 .append(mAccountHandle)
                 .append(" Capabilities: ")
-                .append(mCapabilities)
+                .append(capabilitiesToString(mCapabilities))
                 .append(" Schemes: ");
         for (String scheme : mSupportedUriSchemes) {
             sb.append(scheme)
@@ -698,4 +698,42 @@
         sb.append("]");
         return sb.toString();
     }
+
+    /**
+     * Generates a string representation of a capabilities bitmask.
+     *
+     * @param capabilities The capabilities bitmask.
+     * @return String representation of the capabilities bitmask.
+     */
+    private String capabilitiesToString(int capabilities) {
+        StringBuilder sb = new StringBuilder();
+        if (hasCapabilities(CAPABILITY_VIDEO_CALLING)) {
+            sb.append("Video ");
+        }
+        if (hasCapabilities(CAPABILITY_VIDEO_CALLING_RELIES_ON_PRESENCE)) {
+            sb.append("Presence ");
+        }
+        if (hasCapabilities(CAPABILITY_CALL_PROVIDER)) {
+            sb.append("CallProvider ");
+        }
+        if (hasCapabilities(CAPABILITY_CALL_SUBJECT)) {
+            sb.append("CallSubject ");
+        }
+        if (hasCapabilities(CAPABILITY_CONNECTION_MANAGER)) {
+            sb.append("ConnectionMgr ");
+        }
+        if (hasCapabilities(CAPABILITY_EMERGENCY_CALLS_ONLY)) {
+            sb.append("EmergOnly ");
+        }
+        if (hasCapabilities(CAPABILITY_MULTI_USER)) {
+            sb.append("MultiUser ");
+        }
+        if (hasCapabilities(CAPABILITY_PLACE_EMERGENCY_CALLS)) {
+            sb.append("PlaceEmerg ");
+        }
+        if (hasCapabilities(CAPABILITY_SIM_SUBSCRIPTION)) {
+            sb.append("SimSub ");
+        }
+        return sb.toString();
+    }
 }