[DevTools] replaced slow ::serialize with StringBuilder

[DevTools] replaced slow ::serialize with StringBuilder

FrameId format is "%d.%d" so we can just generate json string without expensive json serializer.

BUG=chromium:588893
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2746053003
Cr-Commit-Position: refs/heads/master@{#458161}
Committed: https://chromium.googlesource.com/chromium/src/+/dc22b660b873876614eb65b97924ad32a052ebae

[kozy, 2017-03-13 15:09:01]

The CQ bit was checked by kozyatinskiy@chromium.org to run a CQ dry run

[kozy, 2017-03-13 15:09:19]

Dmitry, please take a look.

[commit-bot: I haz the power, 2017-03-13 15:09:35]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-13 16:00:54]

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

[commit-bot: I haz the power, 2017-03-13 16:00:55]

Dry run: Try jobs failed on following builders:
  linux_chromium_asan_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  win_chromium_x64_rel_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[dgozman, 2017-03-13 16:50:30]

lgtm

[kozy, 2017-03-20 17:49:59]

The CQ bit was checked by kozyatinskiy@chromium.org

[kozy, 2017-03-20 17:49:59]

The patchset sent to the CQ was uploaded after l-g-t-m from dgozman@chromium.org
Link to the patchset: https://codereview.chromium.org/2746053003/#ps20001
(title: "fixed")

[commit-bot: I haz the power, 2017-03-20 17:50:28]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-20 20:14:12]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1490032199307710,
"parent_rev": "5664563554b429cc617b0ea8ebdd77293852492e", "commit_rev":
"dc22b660b873876614eb65b97924ad32a052ebae"}

[commit-bot: I haz the power, 2017-03-20 20:14:59]

Description was changed from

==========
[DevTools] replaced slow ::serialize with StringBuilder

FrameId format is "%d.%d" so we can just generate json string without expensive
json serializer.

BUG=chromium:588893
R=dgozman@chromium.org
==========

to

==========
[DevTools] replaced slow ::serialize with StringBuilder

FrameId format is "%d.%d" so we can just generate json string without expensive
json serializer.

BUG=chromium:588893
R=dgozman@chromium.org

Review-Url: https://codereview.chromium.org/2746053003
Cr-Commit-Position: refs/heads/master@{#458161}
Committed:
https://chromium.googlesource.com/chromium/src/+/dc22b660b873876614eb65b97924...
==========

[commit-bot: I haz the power, 2017-03-20 20:15:01]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/chromium/src/+/dc22b660b873876614eb65b97924...