Improve Observatory Timeline UI

Improve Observatory Timeline UI

- [x] Remove Stop / Start buttons and replace with fine grained category control.
- [x] Restrict the cpu profile to the time span of the timeline.
- [x] Display recorder name.
- [x] Show a popup when fetching the timeline from the VM.
- [x] Show a popup when fetching the cpu profile(s) from the VM.

Fixes #26401
Fixes #26394

BUG=
R=rmacnak@google.com

Committed: https://github.com/dart-lang/sdk/commit/db07faaa8c6327555f65ef668fccc5c305233e7e

[Cutch, 2016-05-11 22:05:37]

Description was changed from

==========
Improve Observatory Timeline UI

- [x] Remove Stop / Start buttons and replace with fine grained category
control.
- [x] Restrict the cpu profile to the time span of the timeline.
- [x] Display recorder name.
- [x] Show a popup when fetching the timeline from the VM.
- [x] Show a popup when fetching the cpu profile(s) from the VM.

Fixes #26401
Fixes #26394

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

to

==========
Improve Observatory Timeline UI

- [x] Remove Stop / Start buttons and replace with fine grained category
control.
- [x] Restrict the cpu profile to the time span of the timeline.
- [x] Display recorder name.
- [x] Show a popup when fetching the timeline from the VM.
- [x] Show a popup when fetching the cpu profile(s) from the VM.

Fixes #26401
Fixes #26394

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

[Cutch, 2016-05-11 22:05:37]

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

[rmacnak, 2016-05-12 04:21:22]

lgtm

[Cutch, 2016-05-12 14:16:23]

Description was changed from

==========
Improve Observatory Timeline UI

- [x] Remove Stop / Start buttons and replace with fine grained category
control.
- [x] Restrict the cpu profile to the time span of the timeline.
- [x] Display recorder name.
- [x] Show a popup when fetching the timeline from the VM.
- [x] Show a popup when fetching the cpu profile(s) from the VM.

Fixes #26401
Fixes #26394

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

to

==========
Improve Observatory Timeline UI

- [x] Remove Stop / Start buttons and replace with fine grained category
control.
- [x] Restrict the cpu profile to the time span of the timeline.
- [x] Display recorder name.
- [x] Show a popup when fetching the timeline from the VM.
- [x] Show a popup when fetching the cpu profile(s) from the VM.

Fixes #26401
Fixes #26394

BUG=
R=rmacnak@google.com

Committed:
https://github.com/dart-lang/sdk/commit/db07faaa8c6327555f65ef668fccc5c305233e7e
==========

[Cutch, 2016-05-12 14:16:24]

Committed patchset #1 (id:1) manually as
db07faaa8c6327555f65ef668fccc5c305233e7e (presubmit successful).