The first step for enabling off-the-spot IME on Pepper on ChromeOS/Linux.

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index e7f704e4eca30871596fe5b797b064b792bbed39..ee76ae98120b31aff6a48b4f23e216665a542441 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -199,12 +199,12 @@ class RenderWidget : public IPC::Channel::Listener,
   void OnMouseCaptureLost();
   virtual void OnSetFocus(bool enable);
   void OnSetInputMethodActive(bool is_active);
-  void OnImeSetComposition(
+  virtual void OnImeSetComposition(
       const string16& text,
       const std::vector<WebKit::WebCompositionUnderline>& underlines,
       int selection_start,
       int selection_end);
-  void OnImeConfirmComposition(const string16& text);
+  virtual void OnImeConfirmComposition(const string16& text);
   void OnMsgPaintAtSize(const TransportDIB::Handle& dib_id,
                         int tag,
                         const gfx::Size& page_size,
@@ -272,6 +272,11 @@ class RenderWidget : public IPC::Channel::Listener,
   // If they are changed, the new value will be sent to the browser process.
   void UpdateInputMethod();
 
+  // Override point to obtain that the current input method state and caret
+  // position.
+  virtual void GetTextInputType(WebKit::WebTextInputType* type,
+                                WebKit::WebRect* caret_bounds);

[James Su, 2011/05/26 01:29:56]

How about just return the text input type? We don't need to care about the caret
bounds for now.

[kinaba, 2011/05/30 03:07:11]

Done.

+
   // Tells the renderer it does not have focus. Used to prevent us from getting
   // the focus on our own when the browser did not focus us.
   void ClearFocus();