Add a timeline recorder that drops new events after its buffer is full.

Add a timeline recorder that drops new events after its buffer is full.

(With --complete-timeline, my iPod runs of memory processing the
timeline. With the ring recorder, the startup events have already been
bumped out by time I can connect to Observatory.)

BUG=
R=johnmccutchan@google.com

Committed: https://github.com/dart-lang/sdk/commit/1539647e4d3eb2cfc6773b1f1ce06886f6f940f4

[rmacnak, 2016-03-28 23:21:59]

Description was changed from

==========
Add a timeline recorder that drops events after its buffer is full.

(With --complete-timeline, my iPod runs of memory processing the
timeline. With the ring recorder, the startup events have already been
bumped out by time I can connect to Observatory.)

BUG=
==========

to

==========
Add a timeline recorder that drops new events after its buffer is full.

(With --complete-timeline, my iPod runs of memory processing the
timeline. With the ring recorder, the startup events have already been
bumped out by time I can connect to Observatory.)

BUG=
==========

[rmacnak, 2016-03-28 23:46:39]

rmacnak@google.com changed reviewers:
+ johnmccutchan@google.com

[Cutch, 2016-03-29 15:01:26]

Nice! LGTM

[rmacnak, 2016-03-29 18:01:49]

Description was changed from

==========
Add a timeline recorder that drops new events after its buffer is full.

(With --complete-timeline, my iPod runs of memory processing the
timeline. With the ring recorder, the startup events have already been
bumped out by time I can connect to Observatory.)

BUG=
==========

to

==========
Add a timeline recorder that drops new events after its buffer is full.

(With --complete-timeline, my iPod runs of memory processing the
timeline. With the ring recorder, the startup events have already been
bumped out by time I can connect to Observatory.)

BUG=
R=johnmccutchan@google.com

Committed:
https://github.com/dart-lang/sdk/commit/1539647e4d3eb2cfc6773b1f1ce06886f6f940f4
==========

[rmacnak, 2016-03-29 18:01:50]

Committed patchset #2 (id:20001) manually as
1539647e4d3eb2cfc6773b1f1ce06886f6f940f4 (presubmit successful).