Refine tap disambiguation UMA to track same-node/different-node.

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 67143d25c8f9a066980e8a9c4daadbea50fdff22..37d69d717dcc8ed9f7251b35c18430cc7fe8f71d 100644
--- a/content/common/view_messages.h
+++ b/content/common/view_messages.h
@@ -570,11 +570,19 @@ IPC_MESSAGE_ROUTED1(ViewMsg_PpapiBrokerPermissionResult,
                     bool /* result */)
 #endif
 
-// An acknowledge to ViewHostMsg_MultipleTargetsTouched to notify the renderer
-// process to release the magnified image.
+// An acknowledgement to ViewHostMsg_ShowDisambiguationPopup to notify the
+// renderer process to release the magnified image.
 IPC_MESSAGE_ROUTED1(ViewMsg_ReleaseDisambiguationPopupBitmap,
                     cc::SharedBitmapId /* id */)
 
+// If the ViewHostMsg_ShowDisambiguationPopup resulted in the user tapping
+// inside the popup, instruct the renderer to generate a synthetic tap at that
+// offset.
+IPC_MESSAGE_ROUTED3(ViewMsg_ResolveTapDisambiguation,
+                    double /* timestamp_seconds */,
+                    gfx::Point /* tap_viewport_offset */,
+                    bool /* is_long_press */)
+
 // Fetches complete rendered content of a web page as plain text.
 IPC_MESSAGE_ROUTED0(ViewMsg_GetRenderedText)