LockCompositingSurface to make sure frame is not evicted.

content/browser/renderer_host/render_widget_host_view_android.h

 // Copyright (c) 2012 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 266 matching lines @@
   void ShowInternal();
   void HideInternal();
   void AttachLayers();
   void RemoveLayers();
 
   void UpdateBackgroundColor(SkColor color);
 
   // Called after async screenshot task completes. Scales and crops the result
   // of the copy.
   static void PrepareTextureCopyOutputResult(
+      base::WeakPtr<RenderWidgetHostViewAndroid> rwhva,
       const gfx::Size& dst_size_in_pixel,
       SkColorType color_type,
       const base::TimeTicks& start_time,
       const ReadbackRequestCallback& callback,
       std::unique_ptr<cc::CopyOutputResult> result);
 
   // DevTools ScreenCast support for Android WebView.
   void SynchronousCopyContents(const gfx::Rect& src_subrect_in_pixel,
                                const gfx::Size& dst_size_in_pixel,
                                const ReadbackRequestCallback& callback,
@@ skipping 109 matching lines @@
   gfx::Vector2dF last_scroll_offset_;
 
   base::WeakPtrFactory<RenderWidgetHostViewAndroid> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_