mac: Add support for asynchronous dictionary lookup

content/common/text_input_client_messages.h

Index: content/common/text_input_client_messages.h
diff --git a/content/common/text_input_client_messages.h b/content/common/text_input_client_messages.h
index 871778f77bf3901f6e41ff52e877a1e65f6c055c..4c8fb49384eb7ef934bf1007a39db4231992c14c 100644
--- a/content/common/text_input_client_messages.h
+++ b/content/common/text_input_client_messages.h
@@ -33,6 +33,10 @@ IPC_MESSAGE_ROUTED1(TextInputClientMsg_FirstRectForCharacterRange,
 IPC_MESSAGE_ROUTED1(TextInputClientMsg_StringForRange,
                     gfx::Range)
 
+// Tells the renderer to send back the word under the given point and its
+// baseline point.
+IPC_MESSAGE_ROUTED1(TextInputClientMsg_StringAtPoint, gfx::Point)
+
 ////////////////////////////////////////////////////////////////////////////////
 
 // Renderer -> Browser Replies /////////////////////////////////////////////////
@@ -51,5 +55,10 @@ IPC_MESSAGE_ROUTED1(TextInputClientReplyMsg_GotFirstRectForRange,
 // Reply message for TextInputClientMsg_StringForRange.
 IPC_MESSAGE_ROUTED1(TextInputClientReplyMsg_GotStringForRange,
                     mac::AttributedStringCoder::EncodedString)
+
+// Reply message for TextInputClientMsg_StringAtPoint
+IPC_MESSAGE_ROUTED2(TextInputClientReplyMsg_GotStringAtPoint,
+                    mac::AttributedStringCoder::EncodedString,
+                    gfx::Point)
 #endif  // defined(OS_MACOSX)