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

ui/base/resource/resource_bundle.cc

 // 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"
 
 #include <stdint.h>
 
 #include <limits>
 #include <utility>
@@ skipping 812 matching lines @@
                                 bool* fell_back_to_1x) const {
   DCHECK(fell_back_to_1x);
   ResourceHandle* data_handle_100_percent = nullptr;
   for (size_t i = 0; i < data_packs_.size(); ++i) {
     if (data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE &&
         LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
       DCHECK(!*fell_back_to_1x);
       *scale_factor = ui::SCALE_FACTOR_NONE;
       return true;
     }
-    if (data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_100P)
+
+    // There may be multiple SCALE_FACTOR_100P providers, assume only the first
+    // may provide test fallbacks.

[oshima, 2016/10/12 04:22:25]

if this is for tets, can you also check is_test_resources_ as well?

[tapted, 2016/10/20 05:01:13]

Done. Actually, separated out the `is_test_resources_` logic to a separate loop
- neater, and also more flexible.

+    if (!data_handle_100_percent &&
+        data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_100P)
       data_handle_100_percent = data_packs_[i];
 
     if (data_packs_[i]->GetScaleFactor() == *scale_factor &&
         LoadBitmap(*data_packs_[i], resource_id, bitmap, fell_back_to_1x)) {
       return true;
     }
   }
 
   // Unit tests may only have 1x data pack. Allow them to fallback to 1x
   // resources.
@@ skipping 57 matching lines @@
 // static
 bool ResourceBundle::DecodePNG(const unsigned char* buf,
                                size_t size,
                                SkBitmap* bitmap,
                                bool* fell_back_to_1x) {
   *fell_back_to_1x = PNGContainsFallbackMarker(buf, size);
   return gfx::PNGCodec::Decode(buf, size, bitmap);
 }
 
 }  // namespace ui