[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

chrome/browser/renderer_host/render_widget_host_view_mac.h

Index: chrome/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/chrome/browser/renderer_host/render_widget_host_view_mac.h b/chrome/browser/renderer_host/render_widget_host_view_mac.h
index 160197cf6d00892c2d22454c833d4fdcbb7b71f6..28274c6c45840d3a4eb07fdea302e352a561522e 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_mac.h
+++ b/chrome/browser/renderer_host/render_widget_host_view_mac.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -73,12 +73,6 @@ class RWHVMEditCommandHelper;
   // Represents the input-method attributes supported by this object.
   scoped_nsobject<NSArray> validAttributesForMarkedText_;
 
-  // Represents the cursor position in this view coordinate.
-  // The renderer sends the cursor position through an IPC message.
-  // We save the latest cursor position here and return it when an input
-  // methods needs it.
-  NSRect caretRect_;
-
   // Indicates if we are currently handling a key down event.
   BOOL handlingKeyDown_;
 
@@ -95,11 +89,7 @@ class RWHVMEditCommandHelper;
   // the whole content yet.
   NSRange markedRange_;
 
-  // The selected range inside current marked text.
-  // TODO(suzhe): Currently it's only valid when there is any marked text.
-  // In the future, we may need to support accessing the whole content of the
-  // DOM node being edited, then this should be the selected range inside the
-  // DOM node.
+  // The selected range, cached from a message sent by the renderer.
   NSRange selectedRange_;
 
   // Text to be inserted which was generated by handling a key down event.
@@ -127,7 +117,7 @@ class RWHVMEditCommandHelper;
   BOOL pluginImeActive_;
 }
 
-@property(assign, nonatomic) NSRect caretRect;
+@property(nonatomic, readonly) NSRange selectedRange;
 
 - (void)setCanBeKeyView:(BOOL)can;
 - (void)setTakesFocusOnlyOnMouseDown:(BOOL)b;
@@ -202,6 +192,7 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
   virtual void ImeUpdateTextInputState(WebKit::WebTextInputType state,
                                        const gfx::Rect& caret_rect);
   virtual void ImeCancelComposition();
+  virtual void ImeCompositionRangeChanged(int start, int end);
   virtual void DidUpdateBackingStore(
       const gfx::Rect& scroll_rect, int scroll_dx, int scroll_dy,
       const std::vector<gfx::Rect>& copy_rects);
@@ -210,7 +201,7 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
   virtual void WillDestroyRenderWidget(RenderWidgetHost* rwh) {};
   virtual void Destroy();
   virtual void SetTooltipText(const std::wstring& tooltip_text);
-  virtual void SelectionChanged(const std::string& text);
+  virtual void SelectionChanged(const std::string& text, int start, int end);
   virtual BackingStore* AllocBackingStore(const gfx::Size& size);
   virtual void SetTakesFocusOnlyOnMouseDown(bool flag);
   // See comment in RenderWidgetHostView!