Add two instrumentation tests for Web Notifications on Android.

chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationManagerProxyImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationManagerProxyImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationManagerProxyImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationManagerProxyImpl.java
index 6e99a4773f46be08bae741786609828b45ec4cde..b05fd0047b17adb015a4506b96e789b5e158fdd9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationManagerProxyImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/notifications/NotificationManagerProxyImpl.java
@@ -24,7 +24,22 @@ public class NotificationManagerProxyImpl implements NotificationManagerProxy {
     }
 
     @Override
+    public void cancel(String tag, int id) {
+        mNotificationManager.cancel(tag, id);
+    }
+
+    @Override
+    public void cancelAll() {
+        mNotificationManager.cancelAll();
+    }
+
+    @Override
     public void notify(int id, Notification notification) {
         mNotificationManager.notify(id, notification);
     }
+
+    @Override
+    public void notify(String tag, int id, Notification notification) {
+        mNotificationManager.notify(tag, id, notification);
+    }
 }