am bae196df: Merge change 6811 into donut

Merge commit 'bae196df36929647356d03e35cbfbdb453e3833b'

* commit 'bae196df36929647356d03e35cbfbdb453e3833b':
  Fix #1953520. When MENU is down, consume the key in the BrowserActivity which are not shortcut keys. So it won't trigger the search panel. If a shortcut action is taken, reset the mMenuIsDown as it has been used once.