Enable touch dragging on BookMarkManager Splitter

By calling preventDefault on touchstart.

BUG=314607

Review URL: https://codereview.chromium.org/61763007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234059 0039d316-1c4b-4281-b951-d872f2087c98
[NaCl SDK] nacl_io: signal() and sigset() return SIG_DFL by default.

SIG_IGN has a special meaning and should not be returned
by default. This was confusing readline in naclports.

R=binji@chromium.org

Review URL: https://codereview.chromium.org/65363005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234060 0039d316-1c4b-4281-b951-d872f2087c98
Make tooltip icons focusable (and show tooltip bubble on focus).

R=estade@chromium.org
BUG=258553

Review URL: https://codereview.chromium.org/63113004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234061 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234061
Re-enable virtual contexts for all ARM T-6XX models.

Also known as: Revert "Revert "Enable virtual contexts for all ARM T-6xx models instead of just T-604""

The revert turned out to be for a red-herring.

BUG=282479,306690

Review URL: https://codereview.chromium.org/64173010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234062 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234062