Fix the misalignment on CrOS of the tab background images

ui/gfx/image/image_skia_operations.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 "ui/gfx/image/image_skia_operations.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "skia/ext/image_operations.h"
 #include "ui/base/layout.h"
@@ skipping 501 matching lines @@
 }
 
 // static
 ImageSkia ImageSkiaOperations::ExtractSubset(const ImageSkia& image,
                                              const Rect& subset_bounds) {
   gfx::Rect clipped_bounds =
       gfx::IntersectRects(subset_bounds, gfx::Rect(image.size()));
   if (image.isNull() || clipped_bounds.IsEmpty()) {
     return ImageSkia();
   }
+  if (clipped_bounds.size() == image.size())
+    return image;
 
   return ImageSkia(new ExtractSubsetImageSource(image, clipped_bounds),
                    clipped_bounds.size());
 }
 
 // static
 ImageSkia ImageSkiaOperations::CreateResizedImage(
     const ImageSkia& source,
     skia::ImageOperations::ResizeMethod method,
     const Size& target_dip_size) {
@@ skipping 26 matching lines @@
     return ImageSkia();
 
   return ImageSkia(new RotatedSource(source, rotation),
       SkBitmapOperations::ROTATION_180_CW == rotation ?
           source.size() :
           gfx::Size(source.height(), source.width()));
 
 }
 
 }  // namespace gfx