Add overrides to SkAndroidSDKCanvas, update SkHwuiRenderer

Add overrides to SkAndroidSDKCanvas, update SkHwuiRenderer

We can not call android::uirenderer::DisplayListCanvas::reset()
after the object has been constructed (due to an assert), so remove
that call. Add two missing overrides to SkAndroidSDKCanvas:
onDrawAtlas() and onDrawImageNine().

BUG=skia:4216
R=djsollen@google.com

patch from issue 1377533003 at patchset 20001 (http://crrev.com/1377533003#ps20001)

Committed: https://skia.googlesource.com/skia/+/458633496cda2714f175a71e0500335b3681ff16

[tomhudson, 2015-09-30 20:55:05]

The CQ bit was checked by tomhudson@google.com

[commit-bot: I haz the power, 2015-09-30 21:01:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369923003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369923003/1

[commit-bot: I haz the power, 2015-09-30 21:01:03]

Note for Reviewers:
The CQ is waiting for an approval.
If you believe that the CL is not ready yet, or if you would like to L-G-T-M
with comments then please uncheck the CQ checkbox.

Waiting for LGTM from valid reviewer(s) till 2015-10-01 03:01 UTC

[commit-bot: I haz the power, 2015-10-01 03:01:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-01 03:01:07]

No LGTM from a valid reviewer yet. Please ask for an LGTM from a
full Skia committer

[scroggo, 2015-10-01 14:54:33]

On 2015/10/01 03:01:07, commit-bot: I haz the power wrote:
> No LGTM from a valid reviewer yet. Please ask for an LGTM from a
> full Skia committer

LGTM

[tomhudson, 2015-10-01 15:01:02]

The CQ bit was checked by tomhudson@google.com

[commit-bot: I haz the power, 2015-10-01 15:01:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369923003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369923003/1

[commit-bot: I haz the power, 2015-10-01 15:02:27]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/458633496cda2714f175a71e0500335b3681ff16