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 ba65d8f3ff4ac3977e3559ff15888238bf2744a0..116282d77adead0d14baf59e5ca6b5691e41c245 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.h
+++ b/third_party/WebKit/Source/web/WebViewImpl.h
@@ -150,6 +150,7 @@ class WEB_EXPORT WebViewImpl final
   void DidAcquirePointerLock() override;
   void DidNotAcquirePointerLock() override;
   void DidLosePointerLock() override;
+  void ShowContextMenu(WebMenuSourceType) override;
 
   // WebView methods:
   virtual bool IsWebView() const { return true; }
@@ -230,7 +231,6 @@ class WEB_EXPORT WebViewImpl final
                           unsigned inactive_background_color,
                           unsigned inactive_foreground_color) override;
   void PerformCustomContextMenuAction(unsigned action) override;
-  void ShowContextMenu(WebMenuSourceType) override;
   void DidCloseContextMenu() override;
   void HidePopups() override;
   void SetPageOverlayColor(WebColor) override;