[Autofill] Begin adding support for <textarea> fields.

This CL adds support for treating <textarea> fields as autofillable.
It also allows the (local) heuristic-based field type predictor to identify a
textarea as an address field... but will only fill address line 1 into that
field.

BUG=280499
TEST=unit_tests and browser_tests
R=estade@chromium.org

Review URL: https://codereview.chromium.org/25974002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228066 0039d316-1c4b-4281-b951-d872f2087c98
Disable the optimizations for the SyzyASan debug builds of chromium_builder_tests

This will hopefully prevent the linker to run out of memory...

R=scottmg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/26927002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228067 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228067