Specifies transparent background for the label in TileItemView.

ui/app_list/views/tile_item_view.cc

 // Copyright 2014 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/tile_item_view.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/app_list_item.h"
 #include "ui/app_list/app_list_model.h"
 #include "ui/app_list/app_list_view_delegate.h"
 #include "ui/app_list/search_result.h"
 #include "ui/app_list/views/app_list_main_view.h"
+#include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/color_analysis.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/box_layout.h"
 
 namespace {
 
 const int kTileSize = 90;
 const int kTileHorizontalPadding = 10;
 
+// In Windows, transparent background color will cause ugly text rendering,
+// therefore kContentsBackgroundColor should be used. See crbug.com/406989
+#if defined(OS_CHROMEOS)
+const SkColor kTitleBackgroundColor = SK_ColorTRANSPARENT;
+#else
+const SkColor kTitleBackgroundColor = app_list::kContentsBackgroundColor;
+#endif
+
 }  // namespace
 
 namespace app_list {
 
 TileItemView::TileItemView()
     : views::CustomButton(this),
       item_(NULL),
       icon_(new views::ImageView),
       title_(new views::Label) {
   views::BoxLayout* layout_manager = new views::BoxLayout(
       views::BoxLayout::kVertical, kTileHorizontalPadding, 0, 0);
   layout_manager->set_main_axis_alignment(
       views::BoxLayout::MAIN_AXIS_ALIGNMENT_CENTER);
   SetLayoutManager(layout_manager);
 
   icon_->SetImageSize(gfx::Size(kTileIconSize, kTileIconSize));
 
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   title_->SetAutoColorReadabilityEnabled(false);
   title_->SetEnabledColor(kGridTitleColor);
   title_->set_background(views::Background::CreateSolidBackground(
-      app_list::kContentsBackgroundColor));
+      kTitleBackgroundColor));
   title_->SetFontList(rb.GetFontList(kItemTextFontStyle));
   title_->SetHorizontalAlignment(gfx::ALIGN_CENTER);
 
   // When |item_| is NULL, the tile is invisible. Calling SetSearchResult with a
   // non-NULL item makes the tile visible.
   SetVisible(false);
 
   AddChildView(icon_);
   AddChildView(title_);
 }
@@ skipping 40 matching lines @@
   icon_->SetImage(item_->icon());
 }
 
 void TileItemView::OnResultDestroying() {
   if (item_)
     item_->RemoveObserver(this);
   item_ = NULL;
 }
 
 }  // namespace app_list