Updated intent action name to comply with CTS.

	- Updated "android.intent.action.GLOBAL_BUTTON" to
	  @SystemApi

Test: manual - Bottom button on Fugu brings up pairing screen
Test: manual - GUIDE button on Fugu brings up TV channels app

Bug: 37499047
Change-Id: I3b92ed99aeb53674fbaac91126e8c5e7fcffa715
diff --git a/core/java/android/content/Intent.java b/core/java/android/content/Intent.java
index 737ccf26..d746377 100644
--- a/core/java/android/content/Intent.java
+++ b/core/java/android/content/Intent.java
@@ -3228,6 +3228,7 @@
      * caused the broadcast.
      * @hide
      */
+    @SystemApi
     public static final String ACTION_GLOBAL_BUTTON = "android.intent.action.GLOBAL_BUTTON";
 
     /**