Allow getting the theme tint as a value so that it can be applied independent...

app/theme_provider.h

 // Copyright (c) 2009 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 APP_THEME_PROVIDER_H_
 #define APP_THEME_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 #if defined(OS_LINUX)
 #include <gdk/gdk.h>
 #elif defined(OS_MACOSX)
 #ifdef __OBJC__
+@class NSColor;
 @class NSImage;
 #else
+class NSColor;
 class NSImage;
 #endif  // __OBJC__
 #endif  // OS_*
 
 class SkBitmap;
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // ThemeProvider
 //
@@ skipping 29 matching lines @@
   // Gets the GdkPixbuf with the specified |id|.  Returns a pointer to a shared
   // instance of the GdkPixbuf.  This shared GdkPixbuf is owned by the theme
   // provider and should not be freed.
   //
   // The bitmap is assumed to exist. This function will log in release, and
   // assert in debug mode if it does not. On failure, this will return a
   // pointer to a shared empty placeholder bitmap so it will be visible what
   // is missing.
   virtual GdkPixbuf* GetPixbufNamed(int id) = 0;
 #elif defined(OS_MACOSX)
-  // Gets the NSImage with the specified |id|.  Returns a pointer to a shared
-  // instance of the NSImage.  This shared NSImage is owned by the theme
-  // provider and should not be freed.
+  // Gets the NSImage with the specified |id|.
   //
   // The bitmap is not assumed to exist. If a theme does not provide an image,
   // this function will return nil.
+
   virtual NSImage* GetNSImageNamed(int id) = 0;
+  // Gets the NSColor for tinting with the specified |id|.
+  //
+  // The tint is not assumed to exist. If a theme does not provide a tint with
+  // that id, this function will return nil.
+  virtual NSColor* GetNSColorTint(int id) = 0;
 #endif
 };
 
 #endif  // APP_THEME_PROVIDER_H_