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diff --git a/extensions/browser/app_window/apps_client.h b/extensions/browser/app_window/apps_client.h
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+++ b/extensions/browser/app_window/apps_client.h
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+// Copyright 2014 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 EXTENSIONS_BROWSER_APP_WINDOW_APPS_CLIENT_H_
+#define EXTENSIONS_BROWSER_APP_WINDOW_APPS_CLIENT_H_
+
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "extensions/browser/app_window/app_window.h"
+
+namespace content {
+class BrowserContext;
+class WebContents;
+}
+
+namespace extensions {
+
+class Extension;
+class NativeAppWindow;
+
+// Sets up global state for the apps system. Should be Set() once in each
+// process. This should be implemented by the client of the apps system.
+// TODO(hashimoto): Move some functions to ExtensionsClient and rename this to
+// AppWindowClient.
+class AppsClient {
+ public:
+  // Get all loaded browser contexts.
+  virtual std::vector<content::BrowserContext*> GetLoadedBrowserContexts() = 0;
+
+  // Creates a new AppWindow for the app in |extension| for |context|.
+  // Caller takes ownership.
+  virtual AppWindow* CreateAppWindow(content::BrowserContext* context,
+                                     const Extension* extension) = 0;
+
+  // Creates a new extensions::NativeAppWindow for |window|.
+  virtual NativeAppWindow* CreateNativeAppWindow(
+      AppWindow* window,
+      const AppWindow::CreateParams& params) = 0;
+
+  // A positive keep-alive count is a request for the embedding application to
+  // keep running after all windows are closed. The count starts at zero.
+  virtual void IncrementKeepAliveCount() = 0;
+  virtual void DecrementKeepAliveCount() = 0;
+
+  // Opens DevTools window and runs the callback.
+  virtual void OpenDevToolsWindow(content::WebContents* web_contents,
+                                  const base::Closure& callback) = 0;
+
+  // Returns true if the current channel is older than dev.
+  virtual bool IsCurrentChannelOlderThanDev() = 0;
+
+  // Return the apps client.
+  static AppsClient* Get();
+
+  // Initialize the apps system with this apps client.
+  static void Set(AppsClient* client);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_APP_WINDOW_APPS_CLIENT_H_