Allow CanvasSkia to bind to an existing SkCanvas.

chrome/browser/ui/gtk/tabs/tab_renderer_gtk.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/gtk/tabs/tab_renderer_gtk.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/utf_string_conversions.h"
@@ skipping 401 matching lines @@
       x() + favicon_bounds_.x(), offset_y + favicon_bounds_.y(),
       favicon_bounds_.x(), favicon_bounds_.y(),
       favicon_bounds_.width(), favicon_bounds_.height());
 
   if (!IsActive()) {
     double throb_value = GetThrobValue();
     if (throb_value > 0) {
       SkRect bounds;
       bounds.set(favicon_bounds_.x(), favicon_bounds_.y(),
           favicon_bounds_.right(), favicon_bounds_.bottom());
-      canvas.saveLayerAlpha(&bounds, static_cast<int>(throb_value * 0xff),
-                            SkCanvas::kARGB_ClipLayer_SaveFlag);
-      canvas.drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
+      canvas.sk_canvas()->saveLayerAlpha(
+          &bounds, static_cast<int>(throb_value * 0xff),
+          SkCanvas::kARGB_ClipLayer_SaveFlag);
+      canvas.sk_canvas()->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
       SkBitmap* active_bg = theme_service_->GetBitmapNamed(IDR_THEME_TOOLBAR);
       canvas.TileImageInt(*active_bg,
           x() + favicon_bounds_.x(), favicon_bounds_.y(),
           favicon_bounds_.x(), favicon_bounds_.y(),
           favicon_bounds_.width(), favicon_bounds_.height());
-      canvas.restore();
+      canvas.sk_canvas()->restore();
     }
   }
 
   // Now paint the icon.
   PaintIcon(&canvas);
 }
 
 bool TabRendererGtk::ShouldShowIcon() const {
   if (mini() && height() >= GetMinimumUnselectedSize().height()) {
     return true;
@@ skipping 207 matching lines @@
     PaintTitle(canvas);
 
   if (show_icon)
     PaintIcon(canvas);
 }
 
 cairo_surface_t* TabRendererGtk::PaintToSurface() {
   gfx::CanvasSkia canvas(width(), height(), false);
   Paint(&canvas);
   return cairo_surface_reference(cairo_get_target(
-      skia::BeginPlatformPaint(&canvas)));
+      skia::BeginPlatformPaint(canvas.sk_canvas())));
 }
 
 void TabRendererGtk::SchedulePaint() {
   gtk_widget_queue_draw(tab_.get());
 }
 
 gfx::Rect TabRendererGtk::GetLocalBounds() {
   return gfx::Rect(0, 0, bounds_.width(), bounds_.height());
 }
 
@@ skipping 211 matching lines @@
 void TabRendererGtk::PaintTabBackground(gfx::Canvas* canvas) {
   if (IsActive()) {
     PaintActiveTabBackground(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 TabRendererGtk::PaintInactiveTabBackground(gfx::Canvas* canvas) {
 
   // The tab image needs to be lined up with the background image
   // so that it feels partially transparent.
@@ skipping 187 matching lines @@
 
   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
   const gfx::Font& base_font = rb.GetFont(ResourceBundle::BaseFont);
   title_font_ = new gfx::Font(base_font.GetFontName(), kFontPixelSize);
   title_font_height_ = title_font_->GetHeight();
 
   crashed_favicon = rb.GetBitmapNamed(IDR_SAD_FAVICON);
 
   initialized_ = true;
 }