Add the supporting code for the cast system tray integration

chrome/browser/ui/ash/cast_config_delegate_chromeos.h

Index: chrome/browser/ui/ash/cast_config_delegate_chromeos.h
diff --git a/chrome/browser/ui/ash/cast_config_delegate_chromeos.h b/chrome/browser/ui/ash/cast_config_delegate_chromeos.h
new file mode 100644
index 0000000000000000000000000000000000000000..f0c1b58f46fbe0a905d6a46eda9255e4e5e2521c
--- /dev/null
+++ b/chrome/browser/ui/ash/cast_config_delegate_chromeos.h
@@ -0,0 +1,38 @@
+// 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 CHROME_BROWSER_UI_ASH_CAST_CONFIG_DELEGATE_CHROMEOS_H_
+#define CHROME_BROWSER_UI_ASH_CAST_CONFIG_DELEGATE_CHROMEOS_H_
+
+#include <string>
+
+#include "ash/cast_config_delegate.h"
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/values.h"
+
+namespace chromeos {
+
+// A class which allows the ash tray to communicate with the cast extension.
+class CastConfigDelegateChromeos : public ash::CastConfigDelegate {
+ public:
+  CastConfigDelegateChromeos();
+
+ private:
+  ~CastConfigDelegateChromeos() override;
+
+  // CastConfigDelegate:
+  bool HasCastExtension() const override;
+  void GetReceiversAndActivities(
+      const ReceiversAndActivitesCallback& callback) override;
+  void CastToReceiver(const std::string& receiver_id) override;
+  void StopCasting(const std::string& activity_id) override;
+  void LaunchCastOptions() override;
+
+  DISALLOW_COPY_AND_ASSIGN(CastConfigDelegateChromeos);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_UI_ASH_CAST_CONFIG_DELEGATE_CHROMEOS_H_