Tab bar scrolling problem while drag and drop about v5.1.1130.122

[whileloop]

When many tabs are opened, if I try to drag a link from the last tab to the first tab, the tab bar won't scroll to the left.

[Admini]

Seems this is a bug of Chromium.
Need to change "chrome://flags/#tab-scrolling-button-position" to "Enabled - on both sides of the tabstrip", otherwise it can only scroll towards one direction.