Enable the embedded L1/EME support in WebView.

android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java

Index: android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java b/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
index 6ed4911ffaf2dae142ec0c2946e315b850d401c3..ecdb2032e2ae1b4f922dba85a9b5fa013eecef68 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContentViewClient.java
@@ -5,6 +5,7 @@
 package org.chromium.android_webview;
 
 import android.content.Context;
+import android.graphics.RectF;
 import android.view.KeyEvent;
 import android.view.View;
 import android.webkit.URLUtil;
@@ -13,6 +14,7 @@ import android.webkit.WebChromeClient;
 import org.chromium.content.browser.ContentVideoView;
 import org.chromium.content.browser.ContentVideoViewClient;
 import org.chromium.content.browser.ContentViewClient;
+import org.chromium.content.browser.ContentViewCore;
 
 /**
  * ContentViewClient implementation for WebView
@@ -83,4 +85,11 @@ public class AwContentViewClient extends ContentViewClient {
         return mAwSettings != null ?
                 mAwSettings.getBlockNetworkLoads() && URLUtil.isNetworkUrl(url) : true;
     }
+
+    @Override
+    public void onExternalVideoSurfaceNotified(
+            ContentViewCore contentViewCore, int playerId, boolean isRequest, RectF rect) {
+        ExternalVideoSurfaceContainer.getInstance().notifyExternalVideoSurface(
+                contentViewCore, playerId, isRequest, rect);
+    }
 }