Adding app widget restore support in Launcher3 for android L

When the app is restored, it displays placeholders for all pending widgets.
These placeholders can be moved and removed similar to a widget (size is fixed
to what defined in backup). Once the system notifies the launcher of the new
widget ids, the place holders are replaced with actual widgets.

issue: 10779035

Change-Id: I68cbe4da01e9ca2978cb4471a7c645d2aa592055
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 67d86d2..49efc5d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -188,6 +188,13 @@
             </intent-filter>
         </receiver>
 
+        <!-- Intent received used to initialize a restored widget -->
+        <receiver android:name="com.android.launcher3.AppWidgetsRestoredReceiver" >
+            <intent-filter>
+                <action android:name="android.appwidget.action.APPWIDGET_HOST_RESTORED"/>
+            </intent-filter>
+        </receiver>
+
         <!-- New user initialization; set up initial wallpaper -->
         <receiver
             android:name="com.android.launcher3.UserInitializeReceiver"