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

examples/dart/camera_roll/lib/main.dart

Index: examples/dart/camera_roll/lib/main.dart
diff --git a/examples/dart/camera_roll/lib/main.dart b/examples/dart/camera_roll/lib/main.dart
index d0a1bd7061568f75d038a71838cfb756eecb66d9..d0ab8a711419acff13406842d88a11df49dd58de 100644
--- a/examples/dart/camera_roll/lib/main.dart
+++ b/examples/dart/camera_roll/lib/main.dart
@@ -89,7 +89,7 @@ bool handleEvent(Event event) {
 }
 
 void main() {
-  embedder.connectToService("mojo:camera_roll", cameraRoll);
+  embedder.connectToService("mojo:camera", cameraRoll);
   view.setFrameCallback(beginFrame);
   view.setEventCallback(handleEvent);
   getPhoto();