Fixing blink gc dump provider to have thread id in path for single process mode.

Fixing blink gc dump provider to have thread id in path for single process mode.

There can be multiple blink platform impl in the same process when run
using single process mode or when the renderer has workers with blink.
So, the path of the blink GC memory dumps is appended with thread id.
Also, the total size of allocated objects is fixed to correct value.

BUG=490087
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197531

[ssid, 2015-06-19 11:52:54]

ssid@chromium.org changed reviewers:
+ haraken@chromium.org, primiano@chromium.org

[ssid, 2015-06-19 11:52:54]

Small change, PTAL.

[haraken, 2015-06-19 12:09:28]

LGTM

[Primiano Tucci (use gerrit), 2015-06-19 12:42:22]

lgtm

[ssid, 2015-06-20 13:08:54]

The CQ bit was checked by ssid@chromium.org

[ssid, 2015-06-20 13:08:55]

The patchset sent to the CQ was uploaded after l-g-t-m from
haraken@chromium.org, primiano@chromium.org
Link to the patchset: https://codereview.chromium.org/1192803003/#ps40001
(title: "Fixing build")

[commit-bot: I haz the power, 2015-06-20 13:09:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1192803003/40001

[commit-bot: I haz the power, 2015-06-20 15:21:48]

Committed patchset #3 (id:40001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197531