Give Android Wear system apps default permission

This change grants Android Wear system components default
permission.

I have also added a new Intent category to help identify
the main Home handler on Wear.

BUG: 23419042
Change-Id: Ie669a9908bd3b03498f75c5ca22c0fddf52a5203
diff --git a/core/java/android/content/Intent.java b/core/java/android/content/Intent.java
index 6bbee56..7173591 100644
--- a/core/java/android/content/Intent.java
+++ b/core/java/android/content/Intent.java
@@ -3157,6 +3157,13 @@
     @SdkConstant(SdkConstantType.INTENT_CATEGORY)
     public static final String CATEGORY_HOME = "android.intent.category.HOME";
     /**
+     * This is the home activity that is displayed when the device is finished setting up and ready
+     * for use.
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.INTENT_CATEGORY)
+    public static final String CATEGORY_HOME_MAIN = "android.intent.category.HOME_MAIN";
+    /**
      * This is the setup wizard activity, that is the first activity that is displayed
      * when the user sets up the device for the first time.
      * @hide