aw: Add empty functor detach callback

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 0ea766ef60521a617735963d8f855b00a3c03907..02ea4e6bf37448b2b951ebd73f723649cf3c75fa 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -2314,6 +2314,9 @@ public class AwContents implements SmartClipProvider,
         mAwViewMethods.onDetachedFromWindow();
     }
 
+    public void onDrawGLFunctorDetached() {
+    }
+
     /**
      * @see android.view.View#onWindowFocusChanged()
      */