Handle alert severity colors in NativeThemeGtk2.

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

 // Copyright (c) 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 "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_menu_subclasses.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_ui.h"
 #include "chrome/browser/ui/libgtk2ui/gtk2_util.h"
 #include "chrome/browser/ui/libgtk2ui/skia_utils_gtk2.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/color_palette.h"
 #include "ui/gfx/color_utils.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/path.h"
 #include "ui/gfx/skia_util.h"
 #include "ui/native_theme/common_theme.h"
+#include "ui/native_theme/native_theme_aura.h"
+#include "ui/native_theme/native_theme_dark_aura.h"
 
 namespace libgtk2ui {
 
 namespace {
 
 // Theme colors returned by GetSystemColor().
 const SkColor kInvalidColorIdColor = SkColorSetRGB(255, 0, 128);
 const SkColor kURLTextColor = SkColorSetRGB(0x0b, 0x80, 0x43);
 
 // Generates the normal URL color, a green color used in unhighlighted URL
@@ skipping 416 matching lines @@
     case kColorId_ThrobberLightColor:
       return GetSystemColor(kColorId_TextfieldSelectionBackgroundFocused);
 
     case kColorId_ThrobberWaitingColor:
       return color_utils::AlphaBlend(
           GetSystemColor(kColorId_TextfieldSelectionBackgroundFocused),
           GetBGColor(GetWindow(), NORMAL),
           0x80);
 
     // Alert icons
-    // These aren't yet used in any GTK NativeTheme context, so they don't have
-    // definitions.
+    // Just fall back to the same colors as Aura.
     case kColorId_AlertSeverityLow:
     case kColorId_AlertSeverityMedium:
-    case kColorId_AlertSeverityHigh:
+    case kColorId_AlertSeverityHigh: {
+      ui::NativeTheme* fallback_theme =
+          color_utils::IsDark(GetTextColor(GetEntry(), NORMAL))
+              ? ui::NativeThemeAura::instance()
+              : ui::NativeThemeDarkAura::instance();
+      return fallback_theme->GetSystemColor(color_id);
+    }
+
     case kColorId_NumColors:
       NOTREACHED();
       break;
   }
 
   return kInvalidColorIdColor;
 }
 
 // Get ChromeGtkFrame theme colors. No-op in GTK3.
 bool NativeThemeGtk2::GetChromeStyleColor(const char* style_property,
@@ skipping 101 matching lines @@
 
   if (!fake_menu_item) {
     fake_menu_item = gtk_custom_menu_item_new();
     gtk_menu_shell_append(GTK_MENU_SHELL(GetMenu()), fake_menu_item);
   }
 
   return fake_menu_item;
 }
 
 }  // namespace libgtk2ui