Notify RenderWidgets when "tab fullscreen" state changes.

content/renderer/render_widget.cc

 // 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.
 
 #include "content/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
@@ skipping 276 matching lines @@
     if (!new_size.IsEmpty()) {
       if (!is_accelerated_compositing_active_) {
         // Resize should have caused an invalidation of the entire view.
         DCHECK(paint_aggregator_.HasPendingUpdate());
       }
 
       // Send the Resize_ACK flag once we paint again if requested.
       if (resize_ack == SEND_RESIZE_ACK)
         set_next_paint_is_resize_ack();
     }
+  } else {
+    resize_ack = NO_RESIZE_ACK;
   }
 
   if (fullscreen_change)
     DidToggleFullscreen();
 
   // If a resize ack is requested and it isn't set-up, then no more resizes will
   // come in and in general things will go wrong.
   DCHECK(resize_ack != SEND_RESIZE_ACK || new_size.IsEmpty() ||
          next_paint_is_resize_ack());
 }
@@ skipping 1354 matching lines @@
   }
 }
 
 bool RenderWidget::WillHandleMouseEvent(const WebKit::WebMouseEvent& event) {
   return false;
 }
 
 bool RenderWidget::WebWidgetHandlesCompositorScheduling() const {
   return false;
 }