Cast icon should show in sync with media controls

Created a listener in ContentVideoViewLegacy that interested classes can
use to listen for changes in the media controls visibility. Also changed
the touch listener to listen to the whole screen instead of just the
surface view for toggling the media controls visibility.

The corresponding downstream CL:
https://chrome-internal-review.googlesource.com/#/c/155197/

The original CL by maybelle@:
https://codereview.chromium.org/164273002/

BUG=341498
NOTRY=true

Review URL: https://codereview.chromium.org/171233002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252195 0039d316-1c4b-4281-b951-d872f2087c98

content/public/android/java/src/org/chromium/content/browser/ContentVideoViewLegacy.java

@@ -20,24 +20,48 @@ import android.widget.MediaController;
  * https://code.google.com/p/chromium/issues/detail?id=331966
  */
 public class ContentVideoViewLegacy extends ContentVideoView {
-    private MediaController mMediaController;
+    private FullScreenMediaController mMediaController;
     private boolean mCanPause;
     private boolean mCanSeekBackward;
     private boolean mCanSeekForward;
     private int mCurrentBufferPercentage;
+    private MediaControlsVisibilityListener mListener;
+
+    /**
+     * A listener for changes in the MediaController visibility.
+     */
+    public interface MediaControlsVisibilityListener {
+        /**
+         * Callback for when the visibility of the media controls changes.
+         *
+         * @param shown true if the media controls are shown to the user, false otherwise
+         */
+        public void onMediaControlsVisibilityChanged(boolean shown);
+    }
 
     private static class FullScreenMediaController extends MediaController {
 
-        View mVideoView;
+        final View mVideoView;
+        final MediaControlsVisibilityListener mListener;
 
-        public FullScreenMediaController(Context context, View video) {
+        /**
+         * @param context The context.
+         * @param video The full screen video container view.
+         * @param listener A listener that listens to the visibility of media controllers.
+         */
+        public FullScreenMediaController(
+                Context context,
+                View video,
+                MediaControlsVisibilityListener listener) {
             super(context);
             mVideoView = video;
+            mListener = listener;
         }
 
         @Override
         public void show() {
             super.show();
+            if (mListener != null) mListener.onMediaControlsVisibilityChanged(true);
             if (mVideoView != null) {
                 mVideoView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_VISIBLE);
             }
@@ -48,6 +72,7 @@ public class ContentVideoViewLegacy extends ContentVideoView {
             if (mVideoView != null) {
                 mVideoView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
             }
+            if (mListener != null)  mListener.onMediaControlsVisibilityChanged(false);
             super.hide();
         }
     }
@@ -112,7 +137,7 @@ public class ContentVideoViewLegacy extends ContentVideoView {
                 return false;
             }
         });
-        surfaceView.setOnTouchListener(new OnTouchListener() {
+        setOnTouchListener(new OnTouchListener() {
             @Override
             public boolean onTouch(View v, MotionEvent event) {
                 if (isInPlaybackState() && mMediaController != null &&
@@ -184,7 +209,7 @@ public class ContentVideoViewLegacy extends ContentVideoView {
         mCurrentBufferPercentage = 0;
 
         if (mMediaController != null) return;
-        mMediaController = new FullScreenMediaController(getContext(), this);
+        mMediaController = new FullScreenMediaController(getContext(), this, mListener);
         mMediaController.setMediaPlayer(new MediaController.MediaPlayerControl() {
             @Override public boolean canPause() { return mCanPause; }
             @Override public boolean canSeekBackward() { return mCanSeekBackward; }
@@ -265,4 +290,13 @@ public class ContentVideoViewLegacy extends ContentVideoView {
         return true;
     }
 
+    /**
+     * Sets the MediaControlsVisibilityListener that wants to listen to visibility change events.
+     *
+     * @param listener the listener to send the events to.
+     */
+    public void setListener(MediaControlsVisibilityListener listener) {
+        mListener = listener;
+    }
+
 }