AnalysisCanvas is missing an override for virtual void onClipRegion

AnalysisCanvas is missing an override for virtual void onClipRegion

BUG=405364
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=291548

[hendrikw, 2014-08-21 00:24:19]

I couldn't find a webpage that actually ran into this issue, but it's still good
to handle it.  vmpstr, do you know why we call the base onClipRect for each of
the complex clips?  I did the same, but I didn't have a value for soft or hard
edges, so I just picked hard.  I'm not sure if that's correct.

[vmpstr, 2014-08-22 18:25:28]

I think this is correct. From our discussion, we don't really have region clips,
but it's a good thing to override this function anyway.

lgtm, but you'll need an owners review.

[hendrikw, 2014-08-22 18:32:03]

+junov for owner review

[Justin Novosad, 2014-08-22 21:19:23]

On 2014/08/22 18:32:03, Hendrik wrote:
> +junov for owner review

lgtm

[hendrikw, 2014-08-22 21:34:15]

The CQ bit was checked by hendrikw@chromium.org

[commit-bot: I haz the power, 2014-08-22 21:34:56]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hendrikw@chromium.org/492943002/1

[commit-bot: I haz the power, 2014-08-22 22:30:52]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_chromium_rel_swarming on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)
  win_chromium_x64_rel_swarming on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[commit-bot: I haz the power, 2014-08-22 23:24:39]

Committed patchset #1 (1) as 291548