[iOS] Load chrome_300_percent.pak file on @3x devices.

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 <limits>
 #include <vector>
 
 #include "base/big_endian.h"
@@ skipping 451 matching lines @@
   if (scale_factor != ui::SCALE_FACTOR_100P) {
     for (size_t i = 0; i < data_packs_.size(); i++) {
       if (data_packs_[i]->GetScaleFactor() == scale_factor &&
           data_packs_[i]->GetStringPiece(resource_id, &data))
         return data;
     }
   }
   for (size_t i = 0; i < data_packs_.size(); i++) {
     if ((data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_100P ||
          data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_200P ||
+         data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_300P ||
          data_packs_[i]->GetScaleFactor() == ui::SCALE_FACTOR_NONE) &&
         data_packs_[i]->GetStringPiece(resource_id, &data))
       return data;
   }
 
   return base::StringPiece();
 }
 
 base::string16 ResourceBundle::GetLocalizedString(int message_id) {
   base::string16 string;
@@ skipping 374 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