Set the correct buttons for long press action

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

Index: third_party/WebKit/Source/core/input/EventHandler.cpp
diff --git a/third_party/WebKit/Source/core/input/EventHandler.cpp b/third_party/WebKit/Source/core/input/EventHandler.cpp
index 038faa35d7cfaa1d7f062fe119ffeda61e22efb2..64ae4cf589cdec9116b039cb7fc282436e1a4235 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.cpp
+++ b/third_party/WebKit/Source/core/input/EventHandler.cpp
@@ -3034,9 +3034,11 @@ WebInputEventResult EventHandler::sendContextMenuEventForGesture(const GestureEv
 
     if (m_frame->settings() && m_frame->settings()->showContextMenuOnMouseUp())
         eventType = PlatformEvent::MouseReleased;
-    else
-        modifiers |= PlatformEvent::RightButtonDown;
 
+    // Always set right button down as we are sending mousedown event regardless
+    modifiers |= PlatformEvent::RightButtonDown;
+
+    // TODO(crbug.com/579564): Maybe we should not send mouse down at all
     PlatformMouseEvent mouseEvent(targetedEvent.event().position(), targetedEvent.event().globalPosition(), RightButton, eventType, 1,
         static_cast<PlatformEvent::Modifiers>(modifiers),
         PlatformMouseEvent::FromTouch, WTF::monotonicallyIncreasingTime(), WebPointerProperties::PointerType::Mouse);