Enable Chrome Signin from Webstore

chrome/renderer/one_click_signin_agent.h

Index: chrome/renderer/one_click_signin_agent.h
diff --git a/chrome/renderer/one_click_signin_agent.h b/chrome/renderer/one_click_signin_agent.h
new file mode 100644
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+++ b/chrome/renderer/one_click_signin_agent.h
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+// 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.
+
+#ifndef CHROME_RENDERER_ONE_CLICK_SIGNIN_AGENT_H_
+#define CHROME_RENDERER_ONE_CLICK_SIGNIN_AGENT_H_
+
+#include "content/public/renderer/render_view_observer.h"
+
+// OneClickSigninAgent deals with oneclick signin related communications between
+// the renderer and the browser.  There is one OneClickSigninAgent per
+// RenderView.
+class OneClickSigninAgent : public content::RenderViewObserver {
+  public:
+    explicit OneClickSigninAgent(content::RenderView* render_view);
+    virtual ~OneClickSigninAgent();
+
+  private:
+    virtual void WillSubmitForm(WebKit::WebFrame* frame,
+                                const WebKit::WebFormElement& form) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(OneClickSigninAgent);
+};
+
+#endif  // CHROME_RENDERER_ONE_CLICK_SIGNIN_AGENT_H_