Add metric for hidden browser actions and clarify visible/hidden/overflow.

BUG=None

Review URL: https://codereview.chromium.org/173973002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253084 0039d316-1c4b-4281-b951-d872f2087c98
Fix incorrect shift modifier being applied to symbol keys.

BUG=345431

Review URL: https://codereview.chromium.org/171523006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253085 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253085