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diff --git a/webkit/plugins/npapi/webplugin_ime_win.h b/webkit/plugins/npapi/webplugin_ime_win.h
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+++ b/webkit/plugins/npapi/webplugin_ime_win.h
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+// Copyright (c) 2011 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 WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_IME_WIN_H_
+#define WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_IME_WIN_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/string16.h"
+#include "third_party/npapi/bindings/npapi.h"
+#include "ui/gfx/rect.h"
+
+namespace WebKit {
+class WebInputEvent;
+class WebCompositionEvent;
+}
+
+namespace webkit {
+namespace npapi {
+
+class PluginInstance;
+
+// A class that emulates an IME for windowless plug-ins. A windowless plug-in
+// does not have a window. Therefore, we cannot attach an IME to a windowless
+// plug-in. To allow such windowless plug-ins to use IMEs without any changes to
+// them, this class receives the IME data from a browser and patches IMM32
+// functions to return the IME data when a windowless plug-in calls IMM32
+// functions. I would not Flash retrieves pointers to IMM32 functions with
+// GetProcAddress(), this class also needs a hook to GetProcAddress() to
+// dispatch IMM32 function calls from a plug-in to this class as listed in the
+// following snippet.
+//
+//   FARPROC WINAPI GetProcAddressPatch(HMODULE module, LPCSTR name) {
+//     FARPROC* proc = WebPluginIMEWin::GetProcAddress(name);
+//     if (proc)
+//       return proc;
+//     return ::GetProcAddress(module, name);
+//   }
+//   ...
+//   app::win::IATPatchFunction get_proc_address;
+//   get_proc_address.Patch(
+//       GetPluginPath().value().c_str(), "kernel32.dll", "GetProcAddress",
+//       GetProcAddressPatch);
+//
+// After we successfuly dispatch IMM32 calls from a plug-in to this class, we
+// need to update its IME data so the class can return it to the plug-in through
+// its IMM32 calls. To update the IME data, we call CompositionUpdated() or
+// CompositionCompleted() BEFORE sending an IMM32 Window message to the plugin
+// with a SendEvents() call as listed in the following snippet. (Plug-ins call
+// IMM32 functions when it receives IMM32 window messages. We need to update the
+// IME data of this class before sending IMM32 messages so the plug-ins can get
+// the latest data.)
+//
+//   WebPluginIMEWin ime;
+//   ...
+//   string16 text = "composing";
+//   std::vector<int> clauses;
+//   clauses.push_back(0);
+//   clauses.push_back(text.length());
+//   std::vector<int> target;
+//   ime.CompositionUpdated(text, clauses, target, text.length());
+//   ime.SendEvents(instance());
+//
+//   string16 result = "result";
+//   ime.CompositionCompleted(result);
+//   ime.SendEvents(instance());
+//
+// This class also provides GetStatus() so we can retrieve the IME status
+// changed by a plug-in with IMM32 functions. This function is mainly used for
+// retrieving the position of a caret.
+//
+class WebPluginIMEWin {
+ public:
+  // A simple class that allows a plug-in to access a WebPluginIMEWin instance
+  // only in a scope.
+  class ScopedLock {
+   public:
+    explicit ScopedLock(WebPluginIMEWin* instance) : instance_(instance) {
+      if (instance_)
+        instance_->Lock();
+    }
+    ~ScopedLock() {
+      if (instance_)
+        instance_->Unlock();
+    }
+
+   private:
+    WebPluginIMEWin* instance_;
+  };
+
+  WebPluginIMEWin();
+  ~WebPluginIMEWin();
+
+  // Sends raw IME events sent from a browser to this IME emulator and updates
+  // the list of Windows events to be sent to a plug-in. A raw IME event is
+  // mapped to two or more Windows events and it is not so trivial to send these
+  // Windows events to a plug-in. This function inserts Windows events in the
+  // order expected by a plug-in.
+  void CompositionUpdated(const string16& text,
+                          std::vector<int> clauses,
+                          std::vector<int> target,
+                          int cursor_position);
+  void CompositionCompleted(const string16& text);
+
+  // Send all the events added in Update() to a plug-in.
+  bool SendEvents(PluginInstance* instance);
+
+  // Retrieves the status of this IME emulator.
+  bool GetStatus(int* input_type, gfx::Rect* caret_rect);
+
+  // Returns the pointers to IMM32-emulation functions implemented by this
+  // class. This function is used for over-writing the ones returned from
+  // GetProcAddress() calls of Win32 API.
+  static FARPROC GetProcAddress(const char* name);
+
+ private:
+  // Allow (or disallow) the patch functions to use this WebPluginIMEWin
+  // instance through our patch functions. Our patch functions need a static
+  // member variable |instance_| to access a WebPluginIMEWIn instance. We lock
+  // this static variable to prevent two or more plug-ins from accessing a
+  // WebPluginIMEWin instance.
+  void Lock();
+  void Unlock();
+
+  // Retrieve the instance of this class.
+  static WebPluginIMEWin* GetInstance(HIMC context);
+
+  // IMM32 patch functions implemented by this class.
+  static BOOL WINAPI ImmAssociateContextEx(HWND window,
+                                           HIMC context,
+                                           DWORD flags);
+  static LONG WINAPI ImmGetCompositionStringW(HIMC context,
+                                              DWORD index,
+                                              LPVOID dst_data,
+                                              DWORD dst_size);
+  static HIMC WINAPI ImmGetContext(HWND window);
+  static BOOL WINAPI ImmReleaseContext(HWND window, HIMC context);
+  static BOOL WINAPI ImmSetCandidateWindow(HIMC context,
+                                           CANDIDATEFORM* candidate);
+  static BOOL WINAPI ImmSetOpenStatus(HIMC context, BOOL open);
+
+  // a list of NPEvents to be sent to a plug-in.
+  std::vector<NPEvent> events_;
+
+  // The return value for GCS_COMPSTR.
+  string16 composition_text_;
+
+  // The return value for GCS_RESULTSTR.
+  string16 result_text_;
+
+  // The return value for GCS_COMPATTR.
+  std::string composition_attributes_;
+
+  // The return value for GCS_COMPCLAUSE.
+  std::vector<uint32> composition_clauses_;
+
+  // The return value for GCS_RESULTCLAUSE.
+  uint32 result_clauses_[2];
+
+  // The return value for GCS_CURSORPOS.
+  int cursor_position_;
+
+  // The return value for GCS_DELTASTART.
+  int delta_start_;
+
+  // Whether we are composing text. This variable is used for sending a
+  // WM_IME_STARTCOMPOSITION message when we start composing IME text.
+  bool composing_text_;
+
+  // Whether a plug-in supports IME messages. When a plug-in cannot handle
+  // IME messages, we need to send the IME text with WM_CHAR messages as Windows
+  // does.
+  bool support_ime_messages_;
+
+  // The IME status received from a plug-in.
+  bool status_updated_;
+  int input_type_;
+  gfx::Rect caret_rect_;
+
+  // The pointer to the WebPluginIMEWin instance used by patch functions.
+  static WebPluginIMEWin* instance_;
+};
+
+}  // namespace npapi
+}  // namespace webkit
+
+#endif  // WEBKIT_PLUGINS_NPAPI_WEBPLUGIN_IME_WIN_H_