// Sent when a user-initiated drag to resize the container has finished.
extern NSString* const kBrowserActionGrippyDragFinishedNotification;
+// Sent before the dragging will resize the container.
+extern NSString* const kBrowserActionGrippyWillDragNotification;
+
+// Key which is used to notify the translation with delta.
+extern NSString* const kTranslationWithDelta;
+
// The view that encompasses the Browser Action buttons in the toolbar and
// provides mechanisms for resizing.
@interface BrowserActionsContainerView : NSView {