Move upgrade severity colors into NativeTheme.

ui/native_theme/native_theme.h

 // 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.
 
 #ifndef UI_NATIVE_THEME_NATIVE_THEME_H_
 #define UI_NATIVE_THEME_NATIVE_THEME_H_
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "build/build_config.h"
@@ skipping 323 matching lines @@
     kColorId_ResultsTablePositiveSelectedText,
     // Negative text refers to something alarming (often rendered in red), such
     // as the stock value went down.
     kColorId_ResultsTableNegativeText,
     kColorId_ResultsTableNegativeHoveredText,
     kColorId_ResultsTableNegativeSelectedText,
     // Colors for the material spinner (aka throbber).
     kColorId_ThrobberSpinningColor,
     kColorId_ThrobberWaitingColor,
     kColorId_ThrobberLightColor,
+    // Colors for icons that alert, e.g. upgrade reminders.
+    kColorId_AlertSeverityLow,
+    kColorId_AlertSeverityMedium,
+    kColorId_AlertSeverityHigh,
     // TODO(benrg): move other hardcoded colors here.
 
     kColorId_NumColors,
   };
 
   // Return a color from the system theme.
   virtual SkColor GetSystemColor(ColorId color_id) const = 0;
 
   // Returns a shared instance of the native theme that should be used for web
   // rendering. Do not use it in a normal application context (i.e. browser).
@@ skipping 21 matching lines @@
  private:
   // Observers to notify when the native theme changes.
   base::ObserverList<NativeThemeObserver> native_theme_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTheme);
 };
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_NATIVE_THEME_H_