[Android] Properly filter GestureFlingCancel events

[Android] Properly filter GestureFlingCancel events

The browser will drop GestureFlingCancel events when it believes the
renderer has no active fling animations. However, this filtering would
report the event as "consumed", inadverently triggering tap suppression
logic for the subsequent tap.

Instead, report "no consumer exists" for the filtered GestureFlingCancel
events, avoiding spurious tap suppression.

BUG=474882
Committed: https://crrev.com/92801d31b071372560733001086a6e31f58e1ae0
Cr-Commit-Position: refs/heads/master@{#324288}

[jdduke (slow), 2015-04-08 19:34:18]

jdduke@chromium.org changed reviewers:
+ aelias@chromium.org

[jdduke (slow), 2015-04-08 19:34:19]

aelias@: PTAL, thanks.

[aelias_OOO_until_Jul13, 2015-04-08 19:54:22]

lgtm

[jdduke (slow), 2015-04-08 20:11:03]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2015-04-08 20:11:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1074553002/1

[commit-bot: I haz the power, 2015-04-08 21:40:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-08 21:41:03]

Patchset 1 (id:??) landed as
https://crrev.com/92801d31b071372560733001086a6e31f58e1ae0
Cr-Commit-Position: refs/heads/master@{#324288}