MacViews: Use Cocoa folder icons in tree views.

chrome/browser/resource_delegate_mac.h

+// Copyright 2016 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 CHROME_BROWSER_RESOURCE_DELEGATE_MAC_H_
+#define CHROME_BROWSER_RESOURCE_DELEGATE_MAC_H_
+
+#include "base/macros.h"
+#include "ui/base/resource/resource_bundle.h"
+
+// A resource bundle delegate for Mac. Primary purpose is to intercept certain
+// resource ids, and to provide assets from system APIs for them at runtime.
+class MacResourceDelegate : public ui::ResourceBundle::Delegate {
+ public:
+  MacResourceDelegate();
+  ~MacResourceDelegate() override;
+
+  // ui:ResourceBundle::Delegate implementation:
+  base::FilePath GetPathForResourcePack(const base::FilePath& pack_path,
+                                        ui::ScaleFactor scale_factor) override;
+  base::FilePath GetPathForLocalePack(const base::FilePath& pack_path,
+                                      const std::string& locale) override;
+  gfx::Image GetImageNamed(int resource_id) override;
+  gfx::Image GetNativeImageNamed(int resource_id) override;
+  base::RefCountedStaticMemory* LoadDataResourceBytes(
+      int resource_id,
+      ui::ScaleFactor scale_factor) override;
+  bool GetRawDataResource(int resource_id,
+                          ui::ScaleFactor scale_factor,
+                          base::StringPiece* value) override;
+  bool GetLocalizedString(int message_id, base::string16* value) override;
+  scoped_ptr<gfx::Font> GetFont(ui::ResourceBundle::FontStyle style) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MacResourceDelegate);
+};
+
+#endif  // CHROME_BROWSER_RESOURCE_DELEGATE_MAC_H_