Ensure that the OSK on Windows 8 shows up when we tap on an editable field in any WebContents.

chrome/browser/ui/touch_web_contents_observer_win.h

+// 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_BROWSER_UI_TOUCH_WEB_CONTENTS_OBSERVER_WIN_H_
+#define CHROME_BROWSER_UI_TOUCH_WEB_CONTENTS_OBSERVER_WIN_H_
+
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+// A web contents observer that's used to provide windows touch functionality
+// for touch gestures occurring on WebContents created in the renderer,
+// extensions and apps
+class TouchWebContentsObserver
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<TouchWebContentsObserver> {
+ public:
+  virtual ~TouchWebContentsObserver();
+
+ private:
+  explicit TouchWebContentsObserver(content::WebContents* web_contents);
+  friend class content::WebContentsUserData<TouchWebContentsObserver>;
+
+  // content::WebContentsObserver overrides.
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
+  void OnFocusedNodeTouched(bool editable);
+
+  DISALLOW_COPY_AND_ASSIGN(TouchWebContentsObserver);
+};
+
+#endif  // CHROME_BROWSER_UI_TOUCH_WEB_CONTENTS_OBSERVER_WIN_H_
+