Enables fullscreen subtitle and media control from Blink

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
index 5b3cd356dcbb8fd05fb56427aa9a9d5f348c71a0..d1334959562fb1e99c39e3de847e28bfb7144085 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
@@ -6,6 +6,7 @@ package org.chromium.content.browser;
 
 import android.content.Context;
 import android.graphics.Color;
+import android.graphics.PixelFormat;
 import android.os.Build;
 import android.view.Surface;
 import android.view.SurfaceView;
@@ -59,6 +60,7 @@ public class ContentViewRenderView extends FrameLayout {
         setBackgroundColor(Color.WHITE);
 
         mSurfaceView = createSurfaceView(getContext());
+        mSurfaceView.setZOrderMediaOverlay(true);
         mSurfaceCallback = new SurfaceHolder.Callback() {
             @Override
             public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
@@ -211,6 +213,15 @@ public class ContentViewRenderView extends FrameLayout {
         return mSurfaceView.getHolder().getSurface() != null;
     }
 
+    /**
+     * Enter or leave overlay video mode.
+     */
+    public void setOverlayVideoMode(boolean enabled) {
+        int format = enabled ? PixelFormat.TRANSLUCENT : PixelFormat.OPAQUE;
+        mSurfaceView.getHolder().setFormat(format);
+        nativeSetOverlayVideoMode(mNativeContentViewRenderView, enabled);
+    }
+
     @CalledByNative
     private void requestRender() {
         ContentViewCore contentViewCore = mCurrentContentView != null ?
@@ -276,4 +287,5 @@ public class ContentViewRenderView extends FrameLayout {
     private native void nativeSurfaceSetSize(int nativeContentViewRenderView,
             int width, int height);
     private native boolean nativeComposite(int nativeContentViewRenderView);
+    private native void nativeSetOverlayVideoMode(int nativeContentViewRenderView, boolean enabled);
 }