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 e014e0a98f35ba719226c408bec54f03f73c7673..0804e8509af82f74eed793c4bd530032d5e8798c 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:
@@ -2062,6 +2068,7 @@ 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);
@@ -2070,8 +2077,20 @@ 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;
@@ -2100,7 +2119,8 @@ 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());