-Add a mojo service to get video frames from the camera through an android service

examples/dart/camera_roll/lib/main.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This example makes use of mojo:camera_roll which is available only when
 // running on Android.
 //
 // Example usage:
 //   pub get
 //   pub run sky_tools build
@@ skipping 71 matching lines @@
   if (event.type == 'pointerup') {
     photoIndex++;
     getPhoto();
     return true;
   }
 
   return false;
 }
 
 void main() {
-  embedder.connectToService("mojo:camera_roll", cameraRoll);
+  embedder.connectToService("mojo:camera", cameraRoll);
   view.setFrameCallback(beginFrame);
   view.setEventCallback(handleEvent);
   getPhoto();
 }