[Android] Offer all TouchMoves to Javascript if TouchStart is consumed

Previously, only TouchMoves that had exceeded the touch slop threshold would
be forwarded to Javascript.  This caused a potential jump and delay of the
initial TouchMove offered to Javascript.  Perform this TouchMove deferral only
if the touch sequence has not yet been consumed (prevent-defaulted), allowing
smooth touch response for Javascript-based scrolling and similar applications.

BUG=323677

Review URL: https://codereview.chromium.org/88253006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@237691 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 237691