[Background Sync] Use GcmNetworkManager to start the browser for sync events.

chrome/android/java/AndroidManifest.xml

Index: chrome/android/java/AndroidManifest.xml
diff --git a/chrome/android/java/AndroidManifest.xml b/chrome/android/java/AndroidManifest.xml
index 3974442fc31fec74a59d4c0eb7f67437418616ee..ee06c7a7c1f5bc70a90de78fdf9c55b43c22fbe4 100644
--- a/chrome/android/java/AndroidManifest.xml
+++ b/chrome/android/java/AndroidManifest.xml
@@ -44,6 +44,7 @@ by a child template that "extends" this file.
     <uses-permission android:name="android.permission.NFC"/>
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS"/>
     <uses-permission android:name="android.permission.READ_SYNC_STATS"/>
+    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

[jkarlin, 2015/09/02 18:16:36]

Is this needed?

[iclelland, 2015/09/02 20:04:48]

Yes, in order to be triggered by the GcmNetworkManager after the device reboots,
the browser needs this permission. (I'm not sure about the other manifest
files).

The permission itself is granted silently: there are no additional permission
upgrade dialogs from the play store, for instance; it just has to be requested
here.

[jkarlin, 2015/09/03 11:11:57]

It should be in all of the manifests then.

[iclelland, 2015/09/03 15:52:06]

Done.

[Yaron, 2015/09/24 16:13:17]

Is that only for M+ or in all cases? I see it isn't marked as dangerous so
you're probably right but adding any permissions makes me anxious given what
we've seen with update rates.

     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
     <uses-permission android:name="android.permission.USE_CREDENTIALS"/>
     <uses-permission android:name="android.permission.VIBRATE"/>
@@ -551,14 +552,14 @@ by a child template that "extends" this file.
             </intent-filter>
         </receiver>
 
-        <!-- Service Worker Background Sync service listener -->
+        <!-- Service Worker Background Sync GCM scheduler task -->
         <service android:name="org.chromium.content.browser.BackgroundSyncLauncherService"
-            android:exported="false" />
-        <receiver android:name="org.chromium.content.browser.BackgroundSyncLauncherService$Receiver">
+            android:permission="com.google.android.gms.permission.BIND_NETWORK_TASK_SERVICE"
+            android:exported="true">
             <intent-filter>
-                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
+                <action android:name="com.google.android.gms.gcm.ACTION_TASK_READY" />
             </intent-filter>
-        </receiver>
+        </service>
 
         <service android:name="org.chromium.chrome.browser.prerender.ChromePrerenderService"
             android:exported="true"