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

content/browser/renderer_host/render_widget_host.cc

Index: content/browser/renderer_host/render_widget_host.cc
diff --git a/content/browser/renderer_host/render_widget_host.cc b/content/browser/renderer_host/render_widget_host.cc
index 77db54b22089e152677a1991e2d7c82d7cb7cca6..339b3106cb1d3698b2dc80456a87294a34e2dfcb 100644
--- a/content/browser/renderer_host/render_widget_host.cc
+++ b/content/browser/renderer_host/render_widget_host.cc
@@ -174,6 +174,8 @@ bool RenderWidgetHost::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnMsgSetCursor)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ImeUpdateTextInputState,
                         OnMsgImeUpdateTextInputState)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_ImeCompositionRangeChanged,
+                        OnMsgImeCompositionRangeChanged)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ImeCancelComposition,
                         OnMsgImeCancelComposition)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DidActivateAcceleratedCompositing,
@@ -1029,6 +1031,11 @@ void RenderWidgetHost::OnMsgImeUpdateTextInputState(
     view_->ImeUpdateTextInputState(type, caret_rect);
 }
 
+void RenderWidgetHost::OnMsgImeCompositionRangeChanged(const ui::Range& range) {
+  if (view_)
+    view_->ImeCompositionRangeChanged(range);
+}
+
 void RenderWidgetHost::OnMsgImeCancelComposition() {
   if (view_)
     view_->ImeCancelComposition();