[TTS] Add an ACK message to SelectWordAroundCaret.

content/common/view_messages.h

Index: content/common/view_messages.h
diff --git a/content/common/view_messages.h b/content/common/view_messages.h
index 93459214ab4475afb0eac075e1528f09a813472d..3f6d6656c4e71813ee1517b4a94c15e2c29a53c9 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -883,6 +883,13 @@ IPC_MESSAGE_ROUTED2(ViewHostMsg_ShowUnhandledTapUIIfNeeded,
                     int /* x */,
                     int /* y */)
 
+// Acknowledges that a SelectWordAroundCaret completed with the specified
+// result and adjustments to the selection offsets.
+IPC_MESSAGE_ROUTED3(ViewHostMsg_SelectWordAroundCaret_ACK,

[aelias_OOO_until_Jul13, 2017/02/22 03:36:00]

Style nit: ViewHostMsg_SelectWordAroundCaretAck

[Donn Denman, 2017/02/22 23:13:01]

Done.

+                    bool /* did_select */,
+                    int /* start_adjust */,
+                    int /* end_adjust */)
+
 #elif defined(OS_MACOSX)
 // Receives content of a web page as plain text.
 IPC_MESSAGE_ROUTED1(ViewMsg_GetRenderedTextCompleted, std::string)