Make WebWidget::resize early out if the size doesn't change.

content/renderer/render_widget_fullscreen_pepper.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_fullscreen_pepper.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 129 matching lines @@
   }
 
   virtual ~PepperWidget() {}
 
   // WebWidget API
   void close() override { delete this; }
 
   WebSize size() override { return size_; }
 
   void resize(const WebSize& size) override {
-    if (!widget_->plugin())
+    if (!widget_->plugin() || size_ == size)
       return;
 
     size_ = size;
     WebRect plugin_rect(0, 0, size_.width, size_.height);
     widget_->plugin()->ViewChanged(plugin_rect, plugin_rect, plugin_rect,
                                    std::vector<gfx::Rect>());
     widget_->Invalidate();
   }
 
   void themeChanged() override { NOTIMPLEMENTED(); }
@@ skipping 221 matching lines @@
 GURL RenderWidgetFullscreenPepper::GetURLForGraphicsContext3D() {
   return active_url_;
 }
 
 void RenderWidgetFullscreenPepper::OnDeviceScaleFactorChanged() {
   if (compositor_)
     compositor_->setDeviceScaleFactor(device_scale_factor_);
 }
 
 }  // namespace content