[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 048f4027345a8fa7a4bd382f9c080ed310b9624d..576ce97768cfd5ee7e37b59b4c1d34ec32a76dce 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_mac.h
+++ b/chrome/browser/renderer_host/render_widget_host_view_mac.h
@@ -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.
@@ -130,7 +120,7 @@ class RWHVMEditCommandHelper;
   BOOL mouseEventWasIgnored_;
 }
 
-@property(assign, nonatomic) NSRect caretRect;
+@property(nonatomic, readonly) NSRange selectedRange;
 
 - (void)setCanBeKeyView:(BOOL)can;
 - (void)setTakesFocusOnlyOnMouseDown:(BOOL)b;
@@ -206,6 +196,7 @@ class RenderWidgetHostViewMac : public RenderWidgetHostView {
   virtual void ImeUpdateTextInputState(WebKit::WebTextInputType state,
                                        const gfx::Rect& caret_rect);
   virtual void ImeCancelComposition();
+  virtual void ImeCompositionRangeChanged(const ui::Range& range);
   virtual void DidUpdateBackingStore(
       const gfx::Rect& scroll_rect, int scroll_dx, int scroll_dy,
       const std::vector<gfx::Rect>& copy_rects);
@@ -214,7 +205,8 @@ 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,
+                                const ui::Range& range);
   virtual BackingStore* AllocBackingStore(const gfx::Size& size);
   virtual void SetTakesFocusOnlyOnMouseDown(bool flag);
   // See comment in RenderWidgetHostView!