Enable the embedded L1/EME support in WebView.

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

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
index f8706510de374eca83a599ea0c1f8aa41b010a6e..a68490bdeba7ee78747460c78b4f09071dc888ab 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewClient.java
@@ -161,10 +161,55 @@ public class ContentViewClient {
         }
     }
 
-    public void onExternalVideoSurfaceRequested(int playerId) {
+    // Please contact ycheo@chromium.org (or wonsik@) if you have any questions on the following.

[Ted C, 2014/02/11 18:05:47]

Not something for this change, but I'd like to see this split out of
ContentViewClient.  It seems like this enough functionality to deserve it's own
delegate.

[ycheo (away), 2014/02/14 07:41:04]

Done.

+    // The expected behavior of the media player on the video hole punching is as follows.
+    // 1) If it requests the surface, it will call onRequestExternalVideoSurface().
+    //    When the resolution of the video is changed, it'll call onRequestExternalVideoSurface().
+    // 2) Whenever the size or the position of the video element is changed, it'll notify through
+    //    onExternalVideoSurfacePositionChanged().
+    // 3) Whenever the page to contain the video element is scrolled or zoomed,

[Ted C, 2014/02/11 18:05:47]

"the page [that] contain[s]"

[ycheo (away), 2014/02/14 07:41:04]

Done.

+    //    onExternalVideoSurfaceRenderCoordinatesChanged() will be called.
+    // 4) Usually steps 1) ~ 3) are repeated during the playback.
+    // 5) If the player want not to use the surface any more, it'll call

[Ted C, 2014/02/11 18:05:47]

If the player [no longer needs] the surface anymore, ...

[ycheo (away), 2014/02/14 07:41:04]

Done.

+    //    onReleaseExternalVideoSurface().
+    //
+    // After onRequestExternalVideoSurface() is called, when the surface is created and visible,
+    // calling ContentViewCore.attachExternalVideoSurface() is expected to associate the surface
+    // with the player.
+    // Before onReleaseExternalVideoSurface() is finished or when the surface is invisible,
+    // calling ContentViewCore.detachExternalVideoSurface() is expected to release the association.
+
+    /**
+     * Called when a media player wants to request an external video surface.
+     * This method is used only for the video hole punching.
+     * @param playerId The ID of the media player.
+     */
+    public void onRequestExternalVideoSurface(int playerId) {
+    }
+
+    /**
+     * Called when a media player wants to release an external video surface.
+     * This method is used only for the video hole punching.
+     * @param playerId The ID of the media player.
+     */
+    public void onReleaseExternalVideoSurface(int playerId) {
     }
 
-    public void onGeometryChanged(int playerId, RectF rect) {
+    /**
+     * Called when the position of the video element which uses the external
+     * video surface is changed.
+     * This method is used only for the video hole punching.
+     * @param playerId The ID of the media player.
+     * @param rect The boundary rectangle of the video element.
+     */
+    public void onExternalVideoSurfacePositionChanged(int playerId, RectF rect) {
+    }
+
+    /**
+     * Called when RenderCoordinates are updated.
+     * This method is used only for the video hole punching.
+     */
+    public void onExternalVideoSurfaceRenderCoordinatesChanged() {
     }
 
     public ContentVideoViewClient getContentVideoViewClient() {