Fix race between DPI and window size

content/browser/renderer_host/render_widget_host_impl.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_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 720 matching lines @@
 
   // True if threaded compositing is enabled on this view.
   bool is_threaded_compositing_enabled_;
 
   // Set if we are waiting for a repaint ack for the view.
   bool repaint_ack_pending_;
 
   // True when waiting for RESIZE_ACK.
   bool resize_ack_pending_;
 
+  // Cached copy of the screen info so that it doesn't need to be updated every
+  // time the window is resized.
+  scoped_ptr<WebKit::WebScreenInfo> screen_info_;
+
+  // Set if screen_info_ may have changed and should be recomputed and force a
+  // resize message.
+  bool screen_info_out_of_date_;
+
   // The current size of the RenderWidget.
   gfx::Size current_size_;
 
   // The size of the view's backing surface in non-DPI-adjusted pixels.
   gfx::Size physical_backing_size_;
 
   // The height of the physical backing surface that is overdrawn opaquely in
   // the browser, for example by an on-screen-keyboard (in DPI-adjusted pixels).
   float overdraw_bottom_height_;
 
@@ skipping 156 matching lines @@
   std::queue<base::Callback<void(bool, const SkBitmap&)> > pending_snapshots_;
 
   int64 last_input_number_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_