Selection Action mode triggered like a context menu

content/browser/renderer_host/input/touch_emulator_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_CLIENT_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_CLIENT_H_
 
 #include "content/common/content_export.h"
 #include "content/common/cursors/webcursor.h"
 #include "third_party/WebKit/public/platform/WebGestureEvent.h"
 #include "third_party/WebKit/public/platform/WebTouchEvent.h"
 
 namespace content {
 
 // Emulates touch input with mouse and keyboard.
 class CONTENT_EXPORT TouchEmulatorClient {
  public:
   virtual ~TouchEmulatorClient() {}
 
   virtual void ForwardEmulatedGestureEvent(
       const blink::WebGestureEvent& event) = 0;
   virtual void ForwardEmulatedTouchEvent(const blink::WebTouchEvent& event) = 0;
   virtual void SetCursor(const WebCursor& cursor) = 0;
-  virtual void ShowContextMenuAtPoint(const gfx::Point& point) = 0;
+  virtual void ShowContextMenuAtPoint(const gfx::Point& point,
+                                      bool from_touch = false) = 0;

[boliu, 2017/04/21 21:20:18]

default arg on virtual function banned by styleguide:
https://google.github.io/styleguide/cppguide.html#Default_Arguments

and function overloading is generally still frowned upon even though it's no
longer outright banned

[aelias_OOO_until_Jul13, 2017/04/21 21:42:19]

Default arguments are disallowed by Chromium style guide (only allowed in Blink
style guide)

 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_EMULATOR_CLIENT_H_