Update TrayPopupHeaderButton Visual Feedback
Add a new background to TrayPopupHeaderButton which is used for both mouse and touch feedback. Mouse hover, and tap down, events will trigger the background. Completing a click or tap, or exiting the button, will remove the feedback.
The size of TrayPopupHeadButton has been updated according to the new spec in issue 402515.
TEST=TrayDetailsViewTest.TrayPopupHeaderButtonTouchFeedback, TrayDetailsViewTest.TrayPopupHeaderButtonTouchFeedbackCancellation, TrayDetailsViewTest.TrayPopupHeaderButtonMouseHoverFeedback
BUG=402515
Review URL: https://codereview.chromium.org/
800513002
Cr-Commit-Position: refs/heads/master@{#308000}