Prepare to use gfx::RenderText in views::Label.

ui/app_list/views/cached_label.cc

-// Copyright 2013 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/app_list/views/cached_label.h"
-
-#include "base/strings/utf_string_conversions.h"
-#include "ui/base/resource/resource_bundle.h"
-#include "ui/gfx/canvas.h"
-
-namespace app_list {
-
-CachedLabel::CachedLabel()
-    : needs_repaint_(true) {
-}
-
-void CachedLabel::PaintToBackingImage() {
-  if (image_.size() == size() && !needs_repaint_)
-    return;
-
-  bool is_opaque = SkColorGetA(background_color()) == 0xFF;
-  gfx::Canvas canvas(size(), 1.0f, is_opaque);
-  // If a background is provided, it will initialize the canvas in
-  // View::OnPaintBackground(). Otherwise, the background must be set here.
-  if (!background()) {
-    canvas.FillRect(
-        GetLocalBounds(), background_color(), SkXfermode::kSrc_Mode);
-  }
-  Label::OnPaint(&canvas);
-  image_ = gfx::ImageSkia(canvas.ExtractImageRep());
-  needs_repaint_ = false;
-}
-
-#if defined(OS_WIN)
-void CachedLabel::OnPaint(gfx::Canvas* canvas) {
-  PaintToBackingImage();
-  canvas->DrawImageInt(image_, 0, 0);
-}
-#endif
-
-}  // namespace app_list