Cleaning up Android AppRTCDemo.

- Move signaling code from Activity to a separate class
and add interface for AppRTC signaling. For now
only pure GAE signaling implements this interface.
- Move peer connection, video source and peer connection
and SDP observer code from Activity to a separate class.
- Main Activity class will do only high level calls and
event handling for peer connection and signaling classes.
- Also add video renderer position update and use full
screen for local preview until the connection is established.

BUG=
R=braveyao@webrtc.org, pthatcher@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/24019004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7469 4adac7df-926f-26a2-2b94-8c16560cd09d

talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java

@@ -490,6 +490,15 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
       updateTextureProperties = true;
     }
 
+    public void setPosition(int x, int y, int width, int height,
+        ScalingType scalingType) {
+      texLeft = (x - 50) / 50.0f;
+      texTop = (50 - y) / 50.0f;
+      texRight = Math.min(1.0f, (x + width - 50) / 50.0f);
+      texBottom = Math.max(-1.0f, (50 - y - height) / 50.0f);
+      updateTextureProperties = true;
+    }
+
     @Override
     public void setSize(final int width, final int height) {
       Log.d(TAG, "ID: " + id + ". YuvImageRenderer.setSize: " +
@@ -636,6 +645,23 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
     return yuvImageRenderer;
   }
 
+  public static void update(
+      VideoRenderer.Callbacks renderer,
+      int x, int y, int width, int height, ScalingType scalingType) {
+    Log.d(TAG, "VideoRendererGui.update");
+    if (instance == null) {
+      throw new RuntimeException(
+          "Attempt to update yuv renderer before setting GLSurfaceView");
+    }
+    synchronized (instance.yuvImageRenderers) {
+      for (YuvImageRenderer yuvImageRenderer : instance.yuvImageRenderers) {
+        if (yuvImageRenderer == renderer) {
+          yuvImageRenderer.setPosition(x, y, width, height, scalingType);
+        }
+      }
+    }
+  }
+
   @Override
   public void onSurfaceCreated(GL10 unused, EGLConfig config) {
     Log.d(TAG, "VideoRendererGui.onSurfaceCreated");