Integrating GtkIMContext into the RenderWidgetHostViewGtk class (Take 2)....

chrome/browser/renderer_host/render_widget_host.h

Index: chrome/browser/renderer_host/render_widget_host.h
===================================================================
--- chrome/browser/renderer_host/render_widget_host.h	(revision 19224)
+++ chrome/browser/renderer_host/render_widget_host.h	(working copy)
@@ -281,6 +281,45 @@
   void CancelUpdateTextDirection();
   void NotifyTextDirection();
 
+  // Notifies the renderer whether or not the IME attached to this process is
+  // activated.
+  // When the IME is activated, a renderer process sends IPC messages to notify
+  // the status of its composition node. (This message is mainly used for
+  // notifying the position of the input cursor so that the browser can
+  // display IME windows under the cursor.)
+  void ImeSetInputMode(bool activate);
+
+  // Update the composition node of the renderer (or WebKit).
+  // WebKit has a special node (a composition node) for IMEs to change its text
+  // without affecting any other DOM nodes. When the IME (attached to the
+  // browser) updates its text, the browser sends IPC messages to update the
+  // composition node of the renderer.
+  // (Read the comments of each function for its detail.)
+
+  // Sets the text of the composition node.
+  // This function can also update the cursor position and mark the specified
+  // range in the composition node.
+  // A browser should call this function:
+  // * when it receives a WM_IME_COMPOSITION message with a GCS_COMPSTR flag
+  //   (on Windows);
+  // * when it receives a "preedit_changed" signal of GtkIMContext (on Linux);
+  // * when markedText of NSTextInput is called (on Mac).
+  void ImeSetComposition(const std::wstring& ime_string,
+                         int cursor_position,
+                         int target_start,
+                         int target_end);
+
+  // Finishes an ongoing composition with the specified text.
+  // A browser should call this function:
+  // * when it receives a WM_IME_COMPOSITION message with a GCS_RESULTSTR flag
+  //   (on Windows);
+  // * when it receives a "commit" signal of GtkIMContext (on Linux);
+  // * when insertText of NSTextInput is called (on Mac).
+  void ImeConfirmComposition(const std::wstring& ime_string);
+
+  // Cancels an ongoing composition.
+  void ImeCancelComposition();
+
   // This is for derived classes to give us access to the resizer rect.
   // And to also expose it to the RenderWidgetHostView.
   virtual gfx::Rect GetRootWindowResizerRect() const;