Add machinery to show touch editing context menus in OOPIFs.

third_party/WebKit/public/web/WebWidget.h

Index: third_party/WebKit/public/web/WebWidget.h
diff --git a/third_party/WebKit/public/web/WebWidget.h b/third_party/WebKit/public/web/WebWidget.h
index 4dae362cddce6a367577b5c35ed1a5c488d30abc..19857223db847bf1c5c87f2400ed8f9a60629214 100644
--- a/third_party/WebKit/public/web/WebWidget.h
+++ b/third_party/WebKit/public/web/WebWidget.h
@@ -40,9 +40,10 @@
 #include "public/platform/WebRect.h"
 #include "public/platform/WebSize.h"
 #include "public/platform/WebTextInputInfo.h"
-#include "WebCompositionUnderline.h"
-#include "WebRange.h"
-#include "WebTextDirection.h"
+#include "public/web/WebCompositionUnderline.h"
+#include "public/web/WebMenuSourceType.h"
+#include "public/web/WebRange.h"
+#include "public/web/WebTextDirection.h"
 
 namespace blink {
 
@@ -224,6 +225,9 @@ class WebWidget {
     return false;
   }
 
+  // Called by client to request showing the context menu.
+  virtual void ShowContextMenu(WebMenuSourceType) {}
+
  protected:
   ~WebWidget() {}
 };