Resize images for hi-dpi based on a custom PNG chunk added by GRIT r78, and roll GRIT r78

ui/base/resource/resource_bundle.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_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 #define UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 257 matching lines @@
   // resource pack is loaded.
   void LoadTestResources(const FilePath& path, const FilePath& locale_path);
 
   // Unload the locale specific strings and prepares to load new ones. See
   // comments for ReloadLocaleResources().
   void UnloadLocaleResources();
 
   // Initialize all the gfx::Font members if they haven't yet been initialized.
   void LoadFontsIfNecessary();
 
-  // Creates and returns a new SkBitmap given the data file to look in and the
-  // |resource_id|.  It's up to the caller to free the returned bitmap when
-  // done.
-  SkBitmap* LoadBitmap(const ResourceHandle& dll_inst, int resource_id) const;
+  // Fills the |bitmap| given the data file to look in and the |resource_id|.
+  // Returns false if the resource does not exist.
+  //
+  // If the call succeeds and |fell_back_to_1x| is not NULL, it is set to true
+  // if Chrome's custom csCl PNG chunk is present (indicating that GRIT fell
+  // back to the 100% image), false if not.
+  bool LoadBitmap(const ResourceHandle& data_handle,
+                  int resource_id,
+                  SkBitmap* bitmap,
+                  bool* fell_back_to_1x) const;
 
-  // Creates and returns a new SkBitmap for |resource_id| and |scale_factor|.
-  // Returns NULL if the resource does not exist.
-  SkBitmap* LoadBitmap(int resource_id, ScaleFactor scale_factor) const;
+  // Fills the |bitmap| given the |resource_id| and |scale_factor|.
+  // Returns false if the resource does not exist.
+  bool LoadBitmap(int resource_id,
+                  ScaleFactor scale_factor,
+                  SkBitmap* bitmap,
+                  bool* fell_back_to_1x) const;
 
   // Returns an empty image for when a resource cannot be loaded. This is a
   // bright red bitmap.
   gfx::Image& GetEmptyImage();
 
   const FilePath& GetOverriddenPakPath();
 
   // This pointer is guaranteed to outlive the ResourceBundle instance and may
   // be NULL.
   Delegate* delegate_;
@@ skipping 29 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ResourceBundle);
 };
 
 }  // namespace ui
 
 // TODO(beng): Someday, maybe, get rid of this.
 using ui::ResourceBundle;
 
 #endif  // UI_BASE_RESOURCE_RESOURCE_BUNDLE_H_