aw: Add empty functor detach callback

android_webview/glue/java/src/com/android/webview/chromium/WebViewChromium.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package com.android.webview.chromium;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.assist.AssistStructure.ViewNode;
 import android.content.Context;
@@ skipping 1871 matching lines @@
         if (checkNeedsPost()) {
             mRunQueue.addTask(new Runnable() {
                 @Override
                 public void run() {
                     onDetachedFromWindow();
                 }
             });
             return;
         }
 
+        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.M && !"N".equals(Build.VERSION.CODENAME)) {
+            mAwContents.onDrawGLFunctorDetached();
+        }
         mAwContents.onDetachedFromWindow();
     }
 
     @Override
     public void onVisibilityChanged(final View changedView, final int visibility) {
         // The AwContents will find out the container view visibility before the first draw so we
         // can safely ignore onVisibilityChanged callbacks that happen before init().
         if (mAwContents == null) return;
 
         if (checkNeedsPost()) {
@@ skipping 454 matching lines @@
         mAwContents.extractSmartClipData(x, y, width, height);
     }
 
     // Implements SmartClipProvider
     @Override
     public void setSmartClipResultHandler(final Handler resultHandler) {
         checkThread();
         mAwContents.setSmartClipResultHandler(resultHandler);
     }
 }