Set right button for mousedown/contextmenu of long press gesture

third_party/WebKit/Source/core/input/GestureManager.cpp

Index: third_party/WebKit/Source/core/input/GestureManager.cpp
diff --git a/third_party/WebKit/Source/core/input/GestureManager.cpp b/third_party/WebKit/Source/core/input/GestureManager.cpp
index 4171e89cb9197b23cbf1b6600eb877ce0052d7e0..aee39231a75840aa44e5f9fd996cb58b3a265517 100644
--- a/third_party/WebKit/Source/core/input/GestureManager.cpp
+++ b/third_party/WebKit/Source/core/input/GestureManager.cpp
@@ -363,10 +363,13 @@ WebInputEventResult GestureManager::sendContextMenuEventForGesture(
   PlatformEvent::EventType eventType = PlatformEvent::MousePressed;
   if (m_frame->settings() && m_frame->settings()->showContextMenuOnMouseUp())
     eventType = PlatformEvent::MouseReleased;
+  // TODO(crbug.com/661200): We don't want a mousedown here but text area
+  // cursor doesn't appear on long-tap focus w/o the mousedown.
   PlatformMouseEvent mouseEvent(
       targetedEvent.event().position(), targetedEvent.event().globalPosition(),
-      WebPointerProperties::Button::NoButton, eventType, /* clickCount */ 0,
-      static_cast<PlatformEvent::Modifiers>(modifiers),
+      WebPointerProperties::Button::Right, eventType, /* clickCount */ 1,
+      static_cast<PlatformEvent::Modifiers>(
+          modifiers | PlatformEvent::Modifiers::RightButtonDown),
       PlatformMouseEvent::FromTouch, WTF::monotonicallyIncreasingTime(),
       WebPointerProperties::PointerType::Mouse);