Add ExtendSelectionAndDelete() method to ui::TextInputClient.

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <queue>
@@ skipping 277 matching lines @@
   void ImeConfirmComposition(const string16& text,
                              const ui::Range& replacement_range);
 
   // Finishes an ongoing composition with the composition text set by last
   // SetComposition() call.
   void ImeConfirmComposition();
 
   // Cancels an ongoing composition.
   void ImeCancelComposition();
 
+  // Deletes the current selection plus the specified number of characters
+  // before and after the selection or caret.
+  // |before| and |after| can't be negative.
+  void ExtendSelectionAndDelete(int before, int after);

[sky, 2012/09/14 16:14:11]

This is a weird method, why not DeleteRange(const ui::Range&);

[horo, 2012/09/14 16:29:19]

Because of the asynchronous IPC between the browser process and the renderer
process, the selection position which RenderWidgetHostView knows as
RenderWidgetHostViewBase.selection_range_ which is set in
RenderWidgetHostViewBase::SelectionChanged() may be different from the actual
position.

So calling GetSelectionRange() and DeleteRange() is not appropriate.

+
   // 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;
 
   bool ignore_input_events() const {
     return ignore_input_events_;
   }
 
   // Activate deferred plugin handles.
   void ActivateDeferredPluginHandles();
@@ skipping 497 matching lines @@
   SmoothScrollGestureMap active_smooth_scroll_gestures_;
 
   scoped_ptr<GestureEventFilter> gesture_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_