Add missing null-check in OverscrollControllerAndroid::Animate()

Add missing null-check in OverscrollControllerAndroid::Animate()

Without it, there's a crash when running with
disable-overscroll-edge-effect switch.

BUG=501472
Committed: https://crrev.com/e3de7fc7dbb642ed034afa1c1fed70a748a60f35
Cr-Commit-Position: refs/heads/master@{#334897}

[jmanko, 2015-06-17 10:14:33]

jmanko@opera.com changed reviewers:
+ skyostil@chromium.org, tedchoc@chromium.org, yfriedmanc@chromium.org

[Ted C, 2015-06-17 16:54:59]

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

[Ted C, 2015-06-17 16:54:59]

@jdduke is the best reviewer of this

[jdduke (slow), 2015-06-17 19:10:28]

lgtm, thanks. I went ahead and filed a bug so we can pick this to M44.

[jdduke (slow), 2015-06-17 19:10:44]

The CQ bit was checked by jdduke@chromium.org

[commit-bot: I haz the power, 2015-06-17 19:11:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1195453003/1

[commit-bot: I haz the power, 2015-06-17 20:07:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-17 20:09:11]

Patchset 1 (id:??) landed as
https://crrev.com/e3de7fc7dbb642ed034afa1c1fed70a748a60f35
Cr-Commit-Position: refs/heads/master@{#334897}

[twinizzle, 2015-06-17 23:09:33]

twinizzle@gmail.com changed reviewers:
+ twinizzle@gmail.com

[twinizzle, 2015-06-17 23:09:34]

lgtm

[jmanko, 2015-06-18 09:38:54]

On 2015/06/17 19:10:28, jdduke wrote:
> lgtm, thanks. I went ahead and filed a bug so we can pick this to M44.

I see it's been committed already :) great, thanks