Make shelf item can be dragged when context menu is opened.

ash/shelf/shelf_button.cc

Index: ash/shelf/shelf_button.cc
diff --git a/ash/shelf/shelf_button.cc b/ash/shelf/shelf_button.cc
index f8c930d29ce9c4c65a5441bc013f0b3692b0ba3f..a750deb9a4876e580c3ac015e8ff9d4c114386fc 100644
--- a/ash/shelf/shelf_button.cc
+++ b/ash/shelf/shelf_button.cc
@@ -26,6 +26,9 @@
 #include "ui/views/animation/ink_drop_impl.h"
 #include "ui/views/animation/square_ink_drop_ripple.h"
 #include "ui/views/controls/image_view.h"
+#if defined(OS_CHROMEOS)

[xiyuan, 2017/05/16 22:46:56]

Ash code is chromeos only now. So this is not needed.

[minch1, 2017/05/17 16:55:37]

Done.

+#include "ui/views/controls/menu/menu_controller.h"
+#endif
 
 namespace {
 
@@ -461,6 +464,16 @@ void ShelfButton::OnGestureEvent(ui::GestureEvent* event) {
       shelf_view_->PointerReleasedOnButton(this, ShelfView::TOUCH, false);
       event->SetHandled();
       return;
+#if defined(OS_CHROMEOS)
+    case ui::ET_GESTURE_LONG_TAP: {
+      views::MenuController* controller =
+          views::MenuController::GetActiveInstance();
+      if (controller)
+        controller->set_owner_needs_gesture_events(false);
+      event->SetHandled();
+      return;
+    }
+#endif
     default:
       return CustomButton::OnGestureEvent(event);
   }