Expose the Keyboard Shortcuts Helper in Activity

This allows apps to trigger it from their own menus

Bug: 27811273
Change-Id: I028caa5a88bb0e1c51238db28bb496293b78f90b
diff --git a/core/java/android/app/Activity.java b/core/java/android/app/Activity.java
index 0410a6e..70357ea 100644
--- a/core/java/android/app/Activity.java
+++ b/core/java/android/app/Activity.java
@@ -1675,6 +1675,17 @@
     public void onProvideAssistContent(AssistContent outContent) {
     }
 
+    /**
+     * Request the Keyboard Shortcuts screen to show up. If it succeeds, this will trigger
+     * {@link #onProvideKeyboardShortcuts} to retrieve the shortcuts for the foreground activity.
+     */
+    public final void requestKeyboardShortcutsHelper() {
+        Intent intent = new Intent(Intent.ACTION_SHOW_KEYBOARD_SHORTCUTS);
+        intent.setComponent(new ComponentName("com.android.systemui",
+                "com.android.systemui.statusbar.KeyboardShortcutsReceiver"));
+        sendBroadcast(intent);
+    }
+
     @Override
     public void onProvideKeyboardShortcuts(
             List<KeyboardShortcutGroup> data, Menu menu, int deviceId) {
diff --git a/core/java/android/content/Intent.java b/core/java/android/content/Intent.java
index 30f2c94..f060a1c 100644
--- a/core/java/android/content/Intent.java
+++ b/core/java/android/content/Intent.java
@@ -1404,6 +1404,16 @@
     public static final String ACTION_UPGRADE_SETUP = "android.intent.action.UPGRADE_SETUP";
 
     /**
+     * Activity Action: Start the Keyboard Shortcuts Helper screen.
+     * <p>Input: Nothing.
+     * <p>Output: Nothing.
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_SHOW_KEYBOARD_SHORTCUTS =
+            "android.intent.action.SHOW_KEYBOARD_SHORTCUTS";
+
+    /**
      * Activity Action: Show settings for managing network data usage of a
      * specific application. Applications should define an activity that offers
      * options to control data usage.