Makes ui::GetSupportedScaleFactors available on platforms other than Mac

ui/base/resource/resource_bundle_mac.mm

 // 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/base/resource/resource_bundle.h"
 
 #import <AppKit/AppKit.h>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
@@ skipping 38 matching lines @@
 }  // namespace
 
 void ResourceBundle::LoadCommonResources() {
   AddDataPackFromPath(GetResourcesPakFilePath(@"chrome", nil),
                       SCALE_FACTOR_100P);
   AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_100_percent",
                         nil), SCALE_FACTOR_100P);
   AddDataPackFromPath(GetResourcesPakFilePath(@"webkit_resources_100_percent",
                         nil), SCALE_FACTOR_100P);
 
-  // On Windows and ChromeOS we load either the 1x resource or the 2x resource.
-  // On Mac we load both and let the UI framework decide which one to use.
-#if defined(ENABLE_HIDPI)
-  if (base::mac::IsOSLionOrLater()) {
+  // On Mac we load 1x and 2x resources and we let the UI framework decide
+  // which one to use.
+  if (IsScaleFactorSupported(SCALE_FACTOR_200P)) {
     AddDataPackFromPath(GetResourcesPakFilePath(@"chrome_200_percent",
                           nil), SCALE_FACTOR_200P);
     AddDataPackFromPath(GetResourcesPakFilePath(@"webkit_resources_200_percent",
                           nil), SCALE_FACTOR_200P);
   }
-#endif
 }
 
 FilePath ResourceBundle::GetLocaleFilePath(const std::string& app_locale,
                                            bool test_file_exists) {
   NSString* mac_locale = base::SysUTF8ToNSString(app_locale);
 
   // Mac OS X uses "_" instead of "-", so swap to get a Mac-style value.
   mac_locale = [mac_locale stringByReplacingOccurrencesOfString:@"-"
                                                      withString:@"_"];
 
@@ skipping 73 matching lines @@
 
   // Another thread raced the load and has already cached the image.
   if (images_.count(resource_id))
     return images_[resource_id];
 
   images_[resource_id] = image;
   return images_[resource_id];
 }
 
 }  // namespace ui