[memory-infra] Add api to enable heap profiling in MemoryDumpManager

[memory-infra] Add api to enable heap profiling in MemoryDumpManager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, by calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is not called for task profiler.

BUG=700245, 698271

[ssid, 2017-03-28 00:20:13]

Description was changed from

==========
[memory-infra] Add api to enableheap profiling in MemoryDumpmanager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, bu calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is called only when pseudo or native
   mode is enabled and not for task profiler.

BUG=700245
==========

to

==========
[memory-infra] Add api to enable heap profiling in MemoryDumpmanager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, by calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is not called for task profiler.

BUG=700245
==========

[ssid, 2017-03-28 00:20:40]

Patchset #1 (id:1) has been deleted

[ssid, 2017-03-28 00:20:56]

Description was changed from

==========
[memory-infra] Add api to enable heap profiling in MemoryDumpmanager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, by calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is not called for task profiler.

BUG=700245
==========

to

==========
[memory-infra] Add api to enable heap profiling in MemoryDumpManager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, by calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is not called for task profiler.

BUG=700245
==========

[ssid, 2017-03-28 21:57:25]

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

[ssid, 2017-03-28 21:57:26]

ptal, thanks!

[ssid, 2017-03-28 21:57:32]

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

[commit-bot: I haz the power, 2017-03-28 21:59:10]

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

[ssid, 2017-03-29 22:00:05]

Description was changed from

==========
[memory-infra] Add api to enable heap profiling in MemoryDumpManager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, by calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is not called for task profiler.

BUG=700245
==========

to

==========
[memory-infra] Add api to enable heap profiling in MemoryDumpManager

This CL changes:
1. Add ability to enable heap profiling in process without command line
   flag, by calling MDM::EnableHeapProfiling.
2. Introduce BACKGROUND mode in allocation context tracker. This mode
   records only thread names and task locations.
3. MDP::OnHeapProfilingEnabled() is not called for task profiler.

BUG=700245,698271
==========

[ssid, 2017-03-29 22:09:10]

Patchset #3 (id:60001) has been deleted

[ssid, 2017-03-29 22:10:12]

Patchset #1 (id:20001) has been deleted