Don't capture screenshots for in-page navigations.

content/browser/web_contents/aura/overscroll_navigation_overlay.cc

 // Copyright 2014 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/web_contents/aura/overscroll_navigation_overlay.h"
 
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/aura/image_window_delegate.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ skipping 21 matching lines @@
   void SetImage(const gfx::Image& image) {
     image_ = image;
     image_size_ = image.AsImageSkia().size();
   }
   const gfx::Image& image() const { return image_; }
 
  private:
   // Overridden from ui::LayerDelegate:
   virtual void OnPaintLayer(gfx::Canvas* canvas) OVERRIDE {
     if (image_.IsEmpty()) {
-      canvas->DrawColor(SK_ColorGRAY);
+      canvas->DrawColor(SK_ColorWHITE);
     } else {
       SkISize size = canvas->sk_canvas()->getDeviceSize();
       if (size.width() != image_size_.width() ||
           size.height() != image_size_.height()) {
         canvas->DrawColor(SK_ColorWHITE);
       }
       canvas->DrawImageInt(image_.AsImageSkia(), 0, 0);
     }
   }
 
@@ skipping 240 matching lines @@
   // pending entry has been created.
   int committed_entry_id =
       web_contents_->GetController().GetLastCommittedEntry()->GetUniqueID();
   if (committed_entry_id == pending_entry_id_ || !pending_entry_id_) {
     loading_complete_ = true;
     StopObservingIfDone();
   }
 }
 
 }  // namespace content