Implement Desktop Media Picker (Mac version) for Desktop Capture API

chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.mm

+// Copyright (c) 2013 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 "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_cocoa.h"
+
+#import "chrome/browser/ui/cocoa/media_picker/desktop_media_picker_controller.h"
+
+DesktopMediaPickerCocoa::DesktopMediaPickerCocoa() {
+}
+
+DesktopMediaPickerCocoa::~DesktopMediaPickerCocoa() {
+}
+
+void DesktopMediaPickerCocoa::Show(gfx::NativeWindow context,
+                                   gfx::NativeWindow parent,
+                                   const string16& app_name,
+                                   scoped_ptr<DesktopMediaPickerModel> model,
+                                   const DoneCallback& done_callback) {
+  controller_.reset(
+      [[DesktopMediaPickerController alloc] initWithModel:model.Pass()
+                                                 callback:done_callback
+                                                  appName:app_name]);
+  [controller_ showWindow:nil];
+}
+
+// static
+scoped_ptr<DesktopMediaPicker> DesktopMediaPicker::Create() {
+  return scoped_ptr<DesktopMediaPicker>(new DesktopMediaPickerCocoa());
+}