Move the "platform" wrappers in skia/ext to the skia namespace.

base/gfx/native_theme.cc

 // Copyright (c) 2006-2008 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 "base/gfx/native_theme.h"
 
 #include <windows.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
 #include <vssym32.h>
@@ skipping 181 matching lines @@
   DrawFrameControl(hdc, rect, DFC_SCROLL, classic_state);
   return S_OK;
 }
 
 HRESULT NativeTheme::PaintScrollbarTrack(HDC hdc,
                                          int part_id,
                                          int state_id,
                                          int classic_state,
                                          RECT* target_rect,
                                          RECT* align_rect,
-                                         PlatformCanvasWin* canvas) const {
+                                         skia::PlatformCanvasWin* canvas) const {
   HANDLE handle = GetThemeHandle(SCROLLBAR);
   if (handle && draw_theme_)
     return draw_theme_(handle, hdc, part_id, state_id, target_rect, NULL);
 
   // Draw it manually.
   const DWORD colorScrollbar = GetSysColor(COLOR_SCROLLBAR);
   const DWORD color3DFace = GetSysColor(COLOR_3DFACE);
   if ((colorScrollbar != color3DFace) &&
       (colorScrollbar != GetSysColor(COLOR_WINDOW))) {
     FillRect(hdc, target_rect, reinterpret_cast<HBRUSH>(COLOR_SCROLLBAR + 1));
@@ skipping 390 matching lines @@
     break;
   default:
     NOTREACHED();
   }
   theme_handles_[theme_name] = handle;
   return handle;
 }
 
 }  // namespace gfx