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

chrome/browser/renderer_host/render_widget_host_view_gtk.h

 // 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_
 #pragma once
 
 #include <gdk/gdk.h>
 
@@ skipping 36 matching lines @@
                                 public ui::AnimationDelegate {
  public:
   explicit RenderWidgetHostViewGtk(RenderWidgetHost* widget);
   ~RenderWidgetHostViewGtk();
 
   // Initialize this object for use as a drawing area.
   void InitAsChild();
 
   // RenderWidgetHostView implementation.
   virtual void InitAsPopup(RenderWidgetHostView* parent_host_view,
                            const gfx::Rect& pos);

[oshima, 2011/05/25 17:18:18]

can you add OVERRIDE while you're at it?

   virtual void InitAsFullscreen();
   virtual RenderWidgetHost* GetRenderWidgetHost() const;
   virtual void DidBecomeSelected();
   virtual void WasHidden();
   virtual void SetSize(const gfx::Size& size);
   virtual void SetBounds(const gfx::Rect& rect);
   virtual gfx::NativeView GetNativeView();
   virtual void MovePluginWindows(
       const std::vector<webkit::npapi::WebPluginGeometry>& moves);
   virtual void Focus();
@@ skipping 18 matching lines @@
   virtual void SetTooltipText(const std::wstring& tooltip_text);
   virtual void SelectionChanged(const std::string& text,
                                 const ui::Range& range);
   virtual void ShowingContextMenu(bool showing);
   virtual BackingStore* AllocBackingStore(const gfx::Size& size);
   virtual void SetBackground(const SkBitmap& background);
   virtual void CreatePluginContainer(gfx::PluginWindowHandle id);
   virtual void DestroyPluginContainer(gfx::PluginWindowHandle id);
   virtual void SetVisuallyDeemphasized(const SkColor* color, bool animate);
   virtual bool ContainsNativeView(gfx::NativeView native_view) const;
 

[oshima, 2011/05/25 17:18:18]

We should remove this line as well, unless they're from different interface.

   virtual void AcceleratedCompositingActivated(bool activated);
   virtual gfx::PluginWindowHandle GetCompositingSurface();
 

[oshima, 2011/05/25 17:18:18]

ditto

+  virtual void PpapiPluginFocusChanged(bool focused) OVERRIDE;
+
   // ui::AnimationDelegate implementation.
   virtual void AnimationEnded(const ui::Animation* animation);
   virtual void AnimationProgressed(const ui::Animation* animation);
   virtual void AnimationCanceled(const ui::Animation* animation);
 
   gfx::NativeView native_view() const { return view_.get(); }
 
   // If the widget is aligned with an edge of the monitor its on and the user
   // attempts to drag past that edge we track the number of times it has
   // occurred, so that we can force the widget to scroll when it otherwise
@@ skipping 144 matching lines @@
   // menus and drags.
   GdkEventButton* last_mouse_down_;
 
 #if defined(OS_CHROMEOS)
   // Custimized tooltip window.
   scoped_ptr<views::TooltipWindowGtk> tooltip_window_;
 #endif  // defined(OS_CHROMEOS)
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_GTK_H_