Make ContentVideoView progress view visible in WebView

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentVideoViewEmbedder.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentVideoViewEmbedder.java b/content/public/android/java/src/org/chromium/content/browser/ContentVideoViewEmbedder.java
index 198a5a2bb18ed9c744e5b1257fac6adbb8823a6a..db04221abe07e6f0dbbc5e57af0f922ffac22b7c 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentVideoViewEmbedder.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentVideoViewEmbedder.java
@@ -12,7 +12,8 @@ import android.view.View;
  *  This contains the superset of callbacks that must be implemented by the embedder
  *  to support fullscreen video.
  *
- *  {@link #enterFullscreenVideo(View)} and {@link #exitFullscreenVideo()} must be implemented,
+ *  {@link #enterFullscreenVideo(View)}, {@link #exitFullscreenVideo()} and
+ *  {@link #needsVideoSurfaceView} must be implemented,
  *  {@link #getVideoLoadingProgressView()} is optional, and may return null if not required.
  *
  *  The implementer is responsible for displaying the Android view when
@@ -33,6 +34,13 @@ public interface ContentVideoViewEmbedder {
     public void exitFullscreenVideo();
 
     /**
+     * Called during {@link ContentVideoView} creation. If this methos returns true,
+     * {@link ContentVideoView} will have a SurfaceView underlay that will display
+     * actual video playback. Must be implemented.
+     */
+    public boolean needsVideoSurfaceView();
+
+    /**
      * Allows the embedder to replace the view indicating that the video is loading.
      * If null is returned, the default video loading view is used.
      */