cc: Disallow scroll offset animations when impl-scrolling isn't supported

cc: Disallow scroll offset animations when impl-scrolling isn't supported

SingleThreadProxy doesn't support directly changing scroll offsets on
the impl layer tree (since it doesn't send scroll deltas from the impl
side back to the main-thread side). This means that scroll offset
animations should be disallowed by cc when using SingleThreadProxy.

BUG=243871
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281140

[Ian Vollick, 2014-07-02 20:48:16]

On 2014/07/02 20:37:39, ajuma wrote:

lgtm!

[ajuma, 2014-07-02 20:49:54]

The CQ bit was checked by ajuma@chromium.org

[commit-bot: I haz the power, 2014-07-02 20:51:13]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ajuma@chromium.org/368883003/20001

[commit-bot: I haz the power, 2014-07-02 23:29:55]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-07-03 03:03:14]

Change committed as 281140