[Android WebView] Inform ContentViewCore about double tap support status

When WebSettings.UseWideviewport is turned off, double tap support is
disabled on the Blink side only, which means, ContentViewCore still
induces 300ms double tap detection delay, even though the recognized
double tap will be dumped on the Blink side.

This side makes ContentViewCore aware of double tap support status
change due to wide viewport mode update.

BUG=336765
R=boliu@chromium.org

Review URL: https://codereview.chromium.org/144923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@247730 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 247730