mac: Add support for asynchronous dictionary lookup

content/browser/renderer_host/text_input_client_message_filter.h

Index: content/browser/renderer_host/text_input_client_message_filter.h
diff --git a/content/browser/renderer_host/text_input_client_message_filter.h b/content/browser/renderer_host/text_input_client_message_filter.h
index 5a1405ae5ff3cdf9d4e66820ecc916b3519cd8de..51b3225d1677c68ae3dd141dc307e977c937ec64 100644
--- a/content/browser/renderer_host/text_input_client_message_filter.h
+++ b/content/browser/renderer_host/text_input_client_message_filter.h
@@ -9,6 +9,7 @@
 #include "content/public/browser/browser_message_filter.h"
 
 namespace gfx {
+class Point;
 class Range;
 class Rect;
 }
@@ -32,6 +33,9 @@ class CONTENT_EXPORT TextInputClientMessageFilter
 
  private:
   // IPC Message handlers:
+  void OnGotStringAtPoint(
+      const mac::AttributedStringCoder::EncodedString& encoded_string,
+      const gfx::Point& point);
   void OnGotCharacterIndexForPoint(size_t index);
   void OnGotFirstRectForRange(const gfx::Rect& rect);
   void OnGotStringFromRange(