Allow CanvasSkia to bind to an existing SkCanvas.

views/controls/scrollbar/native_scroll_bar_views.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 "views/controls/scrollbar/native_scroll_bar_views.h"
 
 #include "base/logging.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/canvas_skia.h"
@@ skipping 80 matching lines @@
   return native_theme->GetPartSize(GetNativeThemePart(),
                                    GetNativeThemeState(),
                                    GetNativeThemeParams());
 }
 
 void ScrollBarButton::OnPaint(gfx::Canvas* canvas) {
   const gfx::NativeTheme* native_theme = gfx::NativeTheme::instance();
   gfx::Rect bounds;
   bounds.set_size(GetPreferredSize());
 
-  native_theme->Paint(canvas->AsCanvasSkia(),
+  native_theme->Paint(canvas->GetSkCanvas(),
                       GetNativeThemePart(),
                       GetNativeThemeState(),
                       bounds,
                       GetNativeThemeParams());
 }
 
 gfx::NativeTheme::ExtraParams
     ScrollBarButton::GetNativeThemeParams() const {
   gfx::NativeTheme::ExtraParams params;
 
@@ skipping 64 matching lines @@
 gfx::Size ScrollBarThumb::GetPreferredSize() {
   const gfx::NativeTheme* native_theme = gfx::NativeTheme::instance();
   return native_theme->GetPartSize(GetNativeThemePart(),
                                    GetNativeThemeState(),
                                    GetNativeThemeParams());
 }
 
 void ScrollBarThumb::OnPaint(gfx::Canvas* canvas) {
   const gfx::NativeTheme* native_theme = gfx::NativeTheme::instance();
 
-  native_theme->Paint(canvas->AsCanvasSkia(),
+  native_theme->Paint(canvas->GetSkCanvas(),
                       GetNativeThemePart(),
                       GetNativeThemeState(),
                       GetLocalBounds(),
                       GetNativeThemeParams());
 }
 
 gfx::NativeTheme::ExtraParams
     ScrollBarThumb::GetNativeThemeParams() const {
   gfx::NativeTheme::ExtraParams params;
 
@@ skipping 98 matching lines @@
 void NativeScrollBarViews::OnPaint(gfx::Canvas* canvas) {
   const gfx::NativeTheme* native_theme = gfx::NativeTheme::instance();
   gfx::Rect bounds = GetTrackBounds();
 
   params_.scrollbar_track.track_x = bounds.x();
   params_.scrollbar_track.track_y = bounds.y();
   params_.scrollbar_track.track_width = bounds.width();
   params_.scrollbar_track.track_height = bounds.height();
 
 
-  native_theme->Paint(canvas->AsCanvasSkia(),
+  native_theme->Paint(canvas->GetSkCanvas(),
                       part_,
                       state_,
                       bounds,
                       params_);
 }
 
 gfx::Size NativeScrollBarViews::GetPreferredSize() {
   if (native_scroll_bar_->IsHorizontal())
     return gfx::Size(0, GetHorizontalScrollBarHeight());
   return gfx::Size(GetVerticalScrollBarWidth(), 0);
@@ skipping 62 matching lines @@
   } else {
     bounds.set_y(bounds.y() + size.height());
     bounds.set_height(std::max(0, bounds.height() - 2 * size.height()));
     bounds.set_width(thumb->GetPreferredSize().width());
   }
 
   return bounds;
 }
 
 }  // namespace views