Add support for painting halos on Views Labels.

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 305 matching lines @@
   state->role = ui::AX_ROLE_STATIC_TEXT;
   state->AddStateFlag(ui::AX_STATE_READ_ONLY);
   state->name = layout_text();
 }
 
 void Label::PaintText(gfx::Canvas* canvas,
                       const base::string16& text,
                       const gfx::Rect& text_bounds,
                       int flags) {
   gfx::ShadowValues shadows;
-  if (has_shadow_)
+  if (has_shadow_) {
     shadows.push_back(gfx::ShadowValue(shadow_offset_, shadow_blur_,
         enabled() ? enabled_shadow_color_ : disabled_shadow_color_));
-  canvas->DrawStringRectWithShadows(text, font_list_,
-      enabled() ? actual_enabled_color_ : actual_disabled_color_,
-      text_bounds, line_height_, flags, shadows);
+  }
+  SkColor color = enabled() ? actual_enabled_color_ : actual_disabled_color_;
+  canvas->DrawStringRectWithShadows(text, font_list_, color, text_bounds,
+                                    line_height_, flags, shadows);
+
+  if (SkColorGetA(halo_color_) != SK_AlphaTRANSPARENT) {
+    canvas->DrawStringRectWithHalo(text, font_list_, color, halo_color_,
+                                   text_bounds, flags);
+  }
 
   if (HasFocus()) {
     gfx::Rect focus_bounds = text_bounds;
     focus_bounds.Inset(-kFocusBorderPadding, -kFocusBorderPadding);
     canvas->DrawFocusRect(focus_bounds);
   }
 }
 
 gfx::Size Label::GetTextSize() const {
   if (!text_size_valid_) {
@@ skipping 51 matching lines @@
   is_obscured_ = false;
   allow_character_break_ = false;
   elide_behavior_ = ELIDE_AT_END;
   collapse_when_hidden_ = false;
   directionality_mode_ = USE_UI_DIRECTIONALITY;
   enabled_shadow_color_ = 0;
   disabled_shadow_color_ = 0;
   shadow_offset_.SetPoint(1, 1);
   has_shadow_ = false;
   shadow_blur_ = 0;
+  halo_color_ = SK_ColorTRANSPARENT;
   cached_heights_.resize(kCachedSizeLimit);
   ResetCachedSize();
 
   SetText(text);
 }
 
 void Label::RecalculateColors() {
   actual_enabled_color_ = auto_color_readability_ ?
       color_utils::GetReadableColor(requested_enabled_color_,
                                     background_color_) :
@@ skipping 145 matching lines @@
     cached_heights_[i] = gfx::Size();
 }
 
 bool Label::ShouldShowDefaultTooltip() const {
   return !is_multi_line_ && !is_obscured_ &&
          gfx::GetStringWidth(layout_text(), font_list_) >
              GetAvailableRect().width();
 }
 
 }  // namespace views