[heap] Report proper GC type in prologue/eplilogue callbacks.

[heap] Report proper GC type in prologue/eplilogue callbacks.

Followup to https://codereview.chromium.org/1288683005

BUG=chromium:521946
LOG=N

Committed: https://crrev.com/052a4cf135af30a9604151f4e19af2961d8a0708
Cr-Commit-Position: refs/heads/master@{#30345}

[Michael Lippautz, 2015-08-25 08:40:02]

mlippautz@chromium.org changed reviewers:
+ haraken@chromium.org

[Michael Lippautz, 2015-08-25 08:40:03]

Is the blink counterpart ready?

[haraken, 2015-08-25 08:40:54]

On 2015/08/25 08:40:03, Michael Lippautz wrote:
> Is the blink counterpart ready?

Yes, the blink side CL has been landed.

[Michael Lippautz, 2015-08-25 08:42:46]

mlippautz@chromium.org changed reviewers:
+ hpayer@chromium.org

[Michael Lippautz, 2015-08-25 08:42:46]

Hannes, pretty please

[Hannes Payer (out of office), 2015-08-25 08:50:47]

lgtm

[Michael Lippautz, 2015-08-25 08:52:17]

The CQ bit was checked by mlippautz@chromium.org

[commit-bot: I haz the power, 2015-08-25 08:52:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1313023002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1313023002/1

[commit-bot: I haz the power, 2015-08-25 09:21:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-25 09:22:16]

Patchset 1 (id:??) landed as
https://crrev.com/052a4cf135af30a9604151f4e19af2961d8a0708
Cr-Commit-Position: refs/heads/master@{#30345}