Add machinery to show touch editing context menus in OOPIFs.

third_party/WebKit/Source/web/WebViewImpl.h

Index: third_party/WebKit/Source/web/WebViewImpl.h
diff --git a/third_party/WebKit/Source/web/WebViewImpl.h b/third_party/WebKit/Source/web/WebViewImpl.h
index 2898f9c3d2d7c1b29a0ac4778ffdec4edceb3105..4bba482b9e580f28fa2a44e2ef4c3dc4c5a34fd3 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -151,6 +151,7 @@ class WEB_EXPORT WebViewImpl final
   void DidAcquirePointerLock() override;
   void DidNotAcquirePointerLock() override;
   void DidLosePointerLock() override;
+  void ShowContextMenu() override;
 
   // WebView methods:
   virtual bool IsWebView() const { return true; }
@@ -231,7 +232,6 @@ class WEB_EXPORT WebViewImpl final
                           unsigned inactive_background_color,
                           unsigned inactive_foreground_color) override;
   void PerformCustomContextMenuAction(unsigned action) override;
-  void ShowContextMenu() override;
   void DidCloseContextMenu() override;
   void HidePopups() override;
   void SetPageOverlayColor(WebColor) override;