Linux/CrOS smooth scrolling support - behind a flag.

Add runtime flag to control smooth scrolling. Add compile time flag handling for a GYP_DEFINE (enable_smooth_scrolling=1).

BUG=575,61140
TEST=compile still works without the flag. Compiling with the flag works once the WebKit change is landed, and then the flag appears in the about:flags page, and actually turns on that WebKit implementation.


Review URL: http://codereview.chromium.org/7034052

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@90136 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed