Add 2x icons resources to mash.

ui/views/mus/aura_init.h

 // Copyright 2015 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_VIEWS_MUS_AURA_INIT_H_
 #define UI_VIEWS_MUS_AURA_INIT_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 14 matching lines @@
 class Connector;
 }
 
 namespace views {
 class ViewsDelegate;
 
 // Sets up necessary state for aura when run with the viewmanager.
 // |resource_file| is the path to the apk file containing the resources.
 class VIEWS_MUS_EXPORT AuraInit {
  public:
-  AuraInit(shell::Connector* connector, const std::string& resource_file);
+  // |resource_file| is the file to load strings and 1x icons from.
+  // |resource_file_200| can be an empty string, otherwise it is the file to
+  // load 2x icons from.
+  AuraInit(shell::Connector* connector,
+           const std::string& resource_file,
+           const std::string& resource_file_200 = std::string());
+
   ~AuraInit();
 
  private:
   void InitializeResources(shell::Connector* connector);
 
 #if defined(OS_LINUX)
   sk_sp<font_service::FontLoader> font_loader_;
 #endif
 
   const std::string resource_file_;
+  const std::string resource_file_200_;
 
   std::unique_ptr<aura::Env> env_;
   std::unique_ptr<ViewsDelegate> views_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AuraInit);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_MUS_AURA_INIT_H_