improve perf_basic_prof filename reporting

improve perf_basic_prof filename reporting

Re-implement https://codereview.chromium.org/1388543002 after fixing the issue
with SNPrintF crashing on windows when a zero-length buffer is passed in.

R=jkummerow@chromium.org,yangguo@chromium.org,yurys@chromium.org
BUG=chromium:539892
LOG=N

Committed: https://crrev.com/701ba0b255f9c34f4b8c43584ef1e35040474e7d
Cr-Commit-Position: refs/heads/master@{#31197}

[Jakob Kummerow, 2015-10-09 09:51:34]

LGTM

https://codereview.chromium.org/1396843004/diff/40001/test/cctest/test-log.cc
File test/cctest/test-log.cc (right):

https://codereview.chromium.org/1396843004/diff/40001/test/cctest/test-log.cc...
test/cctest/test-log.cc:536: //
https://code.google.com/p/chromium/issues/detail?id=539892
nit: just "crbug.com/539892", it's cleaner.

[ofrobots, 2015-10-09 16:53:56]

https://codereview.chromium.org/1396843004/diff/40001/test/cctest/test-log.cc
File test/cctest/test-log.cc (right):

https://codereview.chromium.org/1396843004/diff/40001/test/cctest/test-log.cc...
test/cctest/test-log.cc:536: //
https://code.google.com/p/chromium/issues/detail?id=539892
On 2015/10/09 09:51:34, Jakob wrote:
> nit: just "crbug.com/539892", it's cleaner.

Done.

[ofrobots, 2015-10-09 16:54:07]

The CQ bit was checked by ofrobots@google.com

[ofrobots, 2015-10-09 16:54:07]

The patchset sent to the CQ was uploaded after l-g-t-m from
jkummerow@chromium.org
Link to the patchset: https://codereview.chromium.org/1396843004/#ps60001
(title: "shorten url in comment")

[commit-bot: I haz the power, 2015-10-09 16:54:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1396843004/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1396843004/60001

[commit-bot: I haz the power, 2015-10-09 17:17:28]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-10-09 17:17:51]

Patchset 4 (id:??) landed as
https://crrev.com/701ba0b255f9c34f4b8c43584ef1e35040474e7d
Cr-Commit-Position: refs/heads/master@{#31197}

[ofrobots, 2015-10-09 17:41:42]

A revert of this CL (patchset #4 id:60001) has been created in
https://codereview.chromium.org/1400813003/ by ofrobots@google.com.

The reason for reverting is: The test-case has issues on windows.
http://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20debug%20-%203....

[ofrobots, 2015-10-12 17:29:57]

Patchset #5 (id:80001) has been deleted