views::Label: Invalidate cached draw flags when background color is changed

ui/views/controls/label.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/label.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <vector>
@@ skipping 90 matching lines @@
   requested_disabled_color_ = color;
   disabled_color_set_ = true;
   RecalculateColors();
 }
 
 void Label::SetBackgroundColor(SkColor color) {
   is_first_paint_text_ = true;
   background_color_ = color;
   background_color_set_ = true;
   RecalculateColors();
+  cached_draw_params_.text.clear();
 }
 
 void Label::SetShadows(const gfx::ShadowValues& shadows) {
   is_first_paint_text_ = true;
   shadows_ = shadows;
   ResetLayoutCache();
 }
 
 void Label::SetSubpixelRenderingEnabled(bool subpixel_rendering_enabled) {
   is_first_paint_text_ = true;
@@ skipping 470 matching lines @@
 }
 
 bool Label::ShouldShowDefaultTooltip() const {
   const gfx::Size text_size = GetTextSize();
   const gfx::Size size = GetContentsBounds().size();
   return !obscured() && (text_size.width() > size.width() ||
                          (multi_line_ && text_size.height() > size.height()));
 }
 
 }  // namespace views