aw: Fix invalidate getting lost

android_webview/browser/browser_view_renderer.h

 // Copyright (c) 2013 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 ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 
 #include "android_webview/browser/global_tile_manager.h"
 #include "android_webview/browser/global_tile_manager_client.h"
 #include "android_webview/browser/shared_renderer_state.h"
@@ skipping 189 matching lines @@
   bool block_invalidates_;
 
   // Holds a callback to FallbackTickFired while it is pending.
   base::CancelableClosure fallback_tick_;
 
   int width_;
   int height_;
 
   DrawGLInput draw_gl_input_;
 
-  // TODO(boliu): This is a short term solution to support
-  // SynchronousCompositorClient methods called on non-UI thread.
-  base::Lock scroll_offset_dip_lock_;
   // Current scroll offset in CSS pixels.
   gfx::Vector2dF scroll_offset_dip_;
 
   // Max scroll offset in CSS pixels.
   gfx::Vector2dF max_scroll_offset_dip_;
 
   // Used to prevent rounding errors from accumulating enough to generate
   // visible skew (especially noticeable when scrolling up and down in the same
   // spot over a period of time).
   gfx::Vector2dF overscroll_rounding_error_;
 
   GlobalTileManager::Key tile_manager_key_;
 
   // The following 2 are used to construct a memory policy and set the memory
   // policy on the shared_renderer_state_ atomically.
   size_t num_tiles_;
   size_t num_bytes_;
 
+  // TODO(boliu): This is a short term solution to support
+  // SynchronousCompositorClient methods called on RenderThread. This is only
+  // used on data that must be modified immediately instead of being posted
+  // back to UI.
+  base::Lock render_thread_lock_;
+
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_