views: Add subpixel rendering test for views::Label.

ui/views/controls/label_unittest.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 "base/i18n/rtl.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/canvas.h"
@@ skipping 823 matching lines @@
       gfx::Canvas::MULTI_LINE |
       gfx::Canvas::TEXT_ALIGN_LEFT |
       gfx::Canvas::NO_ELLIPSIS,
       flags);
 #endif
 
   // Reset Locale
   base::i18n::SetICUDefaultLocale(locale);
 }
 
+// Check that we disable subpixel rendering when a transparent background is
+// being used.
+TEST(LabelTest, DisableSubpixelRendering) {
+  Label label;
+  label.SetBackgroundColor(SK_ColorWHITE);
+  EXPECT_EQ(
+      0, label.ComputeDrawStringFlags() & gfx::Canvas::NO_SUBPIXEL_RENDERING);
+
+  label.SetBackgroundColor(SkColorSetARGB(64, 255, 255, 255));
+  EXPECT_EQ(
+      gfx::Canvas::NO_SUBPIXEL_RENDERING,
+      label.ComputeDrawStringFlags() & gfx::Canvas::NO_SUBPIXEL_RENDERING);
+}
+
 }  // namespace views