In test code, allow any 100% data pack to provide fallbacks.

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 <stddef.h>
 
 #include <map>
@@ skipping 337 matching lines @@
   // If the call succeeds, |fell_back_to_1x| indicates whether Chrome's custom
   // csCl PNG chunk is present (added by GRIT if it falls back to a 100% image).
   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. This may fall back to
   // the data pack with SCALE_FACTOR_NONE, and when this happens,
-  // |scale_factor| will be set to SCALE_FACTOR_100P.
+  // |scale_factor| will be set to SCALE_FACTOR_NONE.

[oshima, 2016/10/24 18:07:09]

Thank you for catching this. Looks like I forgot to update this when impl has
changed.

   bool LoadBitmap(int resource_id,
                   ScaleFactor* scale_factor,
                   SkBitmap* bitmap,
                   bool* fell_back_to_1x) const;
 
   // Returns true if missing scaled resources should be visually indicated when
   // drawing the fallback (e.g., by tinting the image).
   static bool ShouldHighlightMissingScaledResources();
 
   // Returns true if the data in |buf| is a PNG that has the special marker
@@ skipping 53 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_