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.cc

+// Copyright 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/touch_web_contents_observer_win.h"
+
+#include "base/win/win_util.h"
+#include "chrome/common/render_messages.h"
+
+using content::WebContents;
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(TouchWebContentsObserver);
+
+TouchWebContentsObserver::TouchWebContentsObserver(WebContents* web_contents)
+    : content::WebContentsObserver(web_contents) {
+}
+
+TouchWebContentsObserver::~TouchWebContentsObserver() {
+}
+
+bool TouchWebContentsObserver::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(TouchWebContentsObserver, message)
+    IPC_MESSAGE_HANDLER(ChromeViewHostMsg_FocusedNodeTouched,
+                        OnFocusedNodeTouched)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+void TouchWebContentsObserver::OnFocusedNodeTouched(bool editable) {
+#if defined(USE_AURA)
+  if (editable) {
+    base::win::DisplayVirtualKeyboard();
+  } else {
+    base::win::DismissVirtualKeyboard();
+  }
+#endif  // USE_AURA
+}