Fix uninit access in TouchEventQueue

Fix uninit access in TouchEventQueue

Properly initialize |drop_remaining_touches_in_sequence_| after
its addition in https://codereview.chromium.org/586553002/.

TBR=rbyers@chromium.org
NOTRY=true

Committed: https://crrev.com/67a11888ca79c1a60278fd2df22e51abc2d4cb7d
Cr-Commit-Position: refs/heads/master@{#296245}

[jdduke (slow), 2014-09-23 18:26:41]

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

[jdduke (slow), 2014-09-23 18:27:57]

The CQ bit was checked by jdduke@chromium.org

[Lei Zhang, 2014-09-23 18:33:02]

looks good, but I'm not an OWNER.

[Rick Byers, 2014-09-23 18:36:38]

rbyers@chromium.org changed reviewers:
+ rbyers@chromium.org

[Rick Byers, 2014-09-23 18:36:39]

LGTM

[jdduke (slow), 2014-09-23 18:52:32]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2014-09-23 20:31:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/581313003/20001

[commit-bot: I haz the power, 2014-09-23 21:13:06]

Committed patchset #2 (id:20001) as 67f2e8cd58eeff168000b4f5c1057f98126274d4

[commit-bot: I haz the power, 2014-09-23 21:13:40]

Patchset 2 (id:??) landed as
https://crrev.com/67a11888ca79c1a60278fd2df22e51abc2d4cb7d
Cr-Commit-Position: refs/heads/master@{#296245}