Start passing Title text with the context menu data.

public/web/WebContextMenuData.h

Index: public/web/WebContextMenuData.h
diff --git a/public/web/WebContextMenuData.h b/public/web/WebContextMenuData.h
index 718260c157909c89953cf06ff932df74558f8fcc..6e24e1b5c8888a1fa224478b9081ed7ba15c2b35 100644
--- a/public/web/WebContextMenuData.h
+++ b/public/web/WebContextMenuData.h
@@ -119,6 +119,9 @@ struct WebContextMenuData {
     // The raw text of the selection in context.
     WebString selectedText;
 
+    // Title attribute or alt attribute (if title is not available) of the selection in context.
+    WebString titleText;
+
     // Whether spell checking is enabled.
     bool isSpellCheckingEnabled;