Context menu on views must show on mouse down for non-WIN.

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index 6fbd5971f8ec53e09ff2771b3c07154d95585a41..77ad6474f5c793a24d63f5920c82fe88ad4bd1d8 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -57,6 +57,12 @@ bool use_acceleration_when_possible = true;
 bool use_acceleration_when_possible = false;
 #endif
 
+#if defined(OS_WIN)
+const bool kContextMenuOnMousePress = false;
+#else
+const bool kContextMenuOnMousePress = true;
+#endif
+
 // Saves the drawing state, and restores the state when going out of scope.
 class ScopedCanvas {
  public:
@@ -1130,6 +1136,11 @@ void View::ShowContextMenu(const gfx::Point& p, bool is_mouse_gesture) {
   context_menu_controller_->ShowContextMenuForView(this, p);
 }
 
+// static
+bool View::ShouldShowContextMenuOnMousePress() {
+  return kContextMenuOnMousePress;
+}
+
 // Drag and drop ---------------------------------------------------------------
 
 bool View::GetDropFormats(
@@ -2060,6 +2071,7 @@ bool View::ProcessMousePressed(const ui::MouseEvent& event) {
        GetDragOperations(event.location()) : 0;
   ContextMenuController* context_menu_controller = event.IsRightMouseButton() ?
       context_menu_controller_ : 0;
+  View::DragInfo* drag_info = GetDragInfo();
 
   const bool enabled = enabled_;
   const bool result = OnMousePressed(event);
@@ -2068,8 +2080,20 @@ bool View::ProcessMousePressed(const ui::MouseEvent& event) {
   if (!enabled)
     return result;
 
+  if (event.IsOnlyRightMouseButton() && context_menu_controller &&
+      kContextMenuOnMousePress) {
+    // Assume that if there is a context menu controller we won't be deleted
+    // from mouse pressed.
+    gfx::Point location(event.location());
+    if (HitTestPoint(location)) {
+      ConvertPointToScreen(this, &location);
+      ShowContextMenu(location, true);
+      return true;
+    }
+  }
+
   if (drag_operations != ui::DragDropTypes::DRAG_NONE) {
-    GetDragInfo()->PossibleDrag(event.location());
+    drag_info->PossibleDrag(event.location());
     return true;
   }
   return !!context_menu_controller || result;
@@ -2098,7 +2122,8 @@ bool View::ProcessMouseDragged(const ui::MouseEvent& event) {
 }
 
 void View::ProcessMouseReleased(const ui::MouseEvent& event) {
-  if (context_menu_controller_ && event.IsOnlyRightMouseButton()) {
+  if (!kContextMenuOnMousePress && context_menu_controller_ &&
+      event.IsOnlyRightMouseButton()) {
     // Assume that if there is a context menu controller we won't be deleted
     // from mouse released.
     gfx::Point location(event.location());