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This refactors the touch accessibility controller to work like a state
machine, and implements support for double-tap to send a click to the
last location where the user did touch exploration previously. This also
means reimplementing existing touch interactions so that nothing is
passed through until the double-tap timeout passes or the user moves
outside the slop region.

BUG=377900

Review URL: https://codereview.chromium.org/296403011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@275784 0039d316-1c4b-4281-b951-d872f2087c98