ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

ui/views/controls/textfield/textfield.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/views/controls/textfield/textfield.h"
 
 #if defined(TOOLKIT_USES_GTK)
 #include <gdk/gdkkeysyms.h>
 #endif
 
@@ skipping 363 matching lines @@
   // We don't translate accelerators for ALT + NumPad digit on Windows, they are
   // used for entering special characters.  We do translate alt-home.
   if (e.IsAltDown() && (key != ui::VKEY_HOME) &&
       NativeTextfieldWin::IsNumPadDigit(key,
                                         (e.flags() & ui::EF_EXTENDED) != 0))
     return true;
 #endif
   return false;
 }
 
-void Textfield::OnPaintBackground(gfx::Canvas* canvas) {
+void Textfield::OnPaintBackground(gfx::CanvasSkia* canvas) {
   // Overridden to be public - gtk_views_entry.cc wants to call it.
   View::OnPaintBackground(canvas);
 }
 
-void Textfield::OnPaintFocusBorder(gfx::Canvas* canvas) {
+void Textfield::OnPaintFocusBorder(gfx::CanvasSkia* canvas) {
   if (NativeViewHost::kRenderNativeControlFocus)
     View::OnPaintFocusBorder(canvas);
 }
 
 bool Textfield::OnKeyPressed(const views::KeyEvent& e) {
   return native_wrapper_ && native_wrapper_->HandleKeyPressed(e);
 }
 
 bool Textfield::OnKeyReleased(const views::KeyEvent& e) {
   return native_wrapper_ && native_wrapper_->HandleKeyReleased(e);
@@ skipping 67 matching lines @@
     }
 #endif
   }
 }
 
 std::string Textfield::GetClassName() const {
   return kViewClassName;
 }
 
 }  // namespace views