Allow touch flings to bubble if the preceding touch scroll bubbled

If a user's touch scroll bubbles up a layer, and the touch gesture subsequently
turns into a fling, that fling scroll too should bubble. Enable this by tracking
whether each scroll update bubbles, allowing flings preceded by bubbling scrolls
to also bubble.

BUG=270281

Review URL: https://codereview.chromium.org/26831003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228695 0039d316-1c4b-4281-b951-d872f2087c98
Mention the ILP32 & floating point data model of PNaCl in the bitcode ref.

BUG=None
R=jfb@chromium.org

Review URL: https://codereview.chromium.org/27190005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228696 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228696