When DWM compositing is disabled (i.e. XP, RDP) ensure that windowed NPAPI plugins don't cover UI d…

content/browser/renderer_host/render_widget_host_view_aura.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/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
@@ skipping 1235 matching lines @@
           gfx::Rect(current_frame_size_),
           frame,
           base::Bind(callback, present_time));
     }
   }
 }
 
 #if defined(OS_WIN)
 void RenderWidgetHostViewAura::UpdateConstrainedWindowRects(
     const std::vector<gfx::Rect>& rects) {
+  if (rects == constrained_rects_)
+    return;
   constrained_rects_ = rects;
   UpdateCutoutRects();
 }
 
 void RenderWidgetHostViewAura::UpdateCutoutRects() {
   if (!window_->GetRootWindow())
     return;
   HWND parent = window_->GetDispatcher()->GetAcceleratedWidget();
   CutoutRectsParams params;
   params.widget = this;
@@ skipping 2054 matching lines @@
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewAura(widget);
 }
 
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content