Context menus should appear above the touch point if invoked by long press.

content/browser/web_contents/interstitial_page_impl.h

Index: content/browser/web_contents/interstitial_page_impl.h
diff --git a/content/browser/web_contents/interstitial_page_impl.h b/content/browser/web_contents/interstitial_page_impl.h
index a9c0ef9eae1978d975723f5a5b9351b48e6e3214..028ff16e87c8ca378eaea1805c750c39a4f25bf5 100644
--- a/content/browser/web_contents/interstitial_page_impl.h
+++ b/content/browser/web_contents/interstitial_page_impl.h
@@ -113,7 +113,8 @@ class CONTENT_EXPORT InterstitialPageImpl
                                  const gfx::Rect& initial_pos) OVERRIDE;
   virtual void ShowCreatedFullscreenWidget(int route_id) OVERRIDE;
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuEventType& type) OVERRIDE;
 
   // RenderWidgetHostDelegate implementation:
   virtual bool PreHandleKeyboardEvent(