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

Index: ui/base/resource/resource_bundle.h
diff --git a/ui/base/resource/resource_bundle.h b/ui/base/resource/resource_bundle.h
index ef22f675357d99840f08666d7e8a4a28e09cb77c..3dff8bf5897fe3eeb903ec46224a1199db5276d4 100644
--- a/ui/base/resource/resource_bundle.h
+++ b/ui/base/resource/resource_bundle.h
@@ -275,14 +275,23 @@ class UI_EXPORT ResourceBundle {
   // 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;
-
-  // 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 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;
+
+  // 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.