Allow CanvasSkia to bind to an existing SkCanvas.

chrome/browser/ui/views/tabs/tab.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/views/tabs/tab.h"
 
 #include <limits>
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/defaults.h"
@@ skipping 341 matching lines @@
   } else {
     if (mini_title_animation_.get() && mini_title_animation_->is_animating())
       PaintInactiveTabBackgroundWithTitleChange(canvas);
     else
       PaintInactiveTabBackground(canvas);
 
     double throb_value = GetThrobValue();
     if (throb_value > 0) {
       canvas->SaveLayerAlpha(static_cast<int>(throb_value * 0xff),
                              gfx::Rect(width(), height()));
-      canvas->AsCanvasSkia()->drawARGB(0, 255, 255, 255,
-                                       SkXfermode::kClear_Mode);
+      canvas->GetSkCanvas()->drawARGB(0, 255, 255, 255,
+                                      SkXfermode::kClear_Mode);
       PaintActiveTabBackground(canvas);
       canvas->Restore();
     }
   }
 }
 
 void Tab::PaintInactiveTabBackgroundWithTitleChange(gfx::Canvas* canvas) {
   // Render the inactive tab background. We'll use this for clipping.
   gfx::CanvasSkia background_canvas(width(), height(), false);
   PaintInactiveTabBackground(&background_canvas);
@@ skipping 281 matching lines @@
   tab_active_.image_r = rb.GetBitmapNamed(IDR_TAB_ACTIVE_RIGHT);
   tab_active_.l_width = tab_active_.image_l->width();
   tab_active_.r_width = tab_active_.image_r->width();
 
   tab_inactive_.image_l = rb.GetBitmapNamed(IDR_TAB_INACTIVE_LEFT);
   tab_inactive_.image_c = rb.GetBitmapNamed(IDR_TAB_INACTIVE_CENTER);
   tab_inactive_.image_r = rb.GetBitmapNamed(IDR_TAB_INACTIVE_RIGHT);
   tab_inactive_.l_width = tab_inactive_.image_l->width();
   tab_inactive_.r_width = tab_inactive_.image_r->width();
 }