Begin transition to ProcessedSample in Profiler

Begin transition to ProcessedSample in Profiler

- Introduce ProcessedSample and ProcessedSampleBuffer
- Visit SampleBuffer *once* and build ProcessedSampleBuffer
- Stop altering the SampleBuffer when processing samples
- Beginning of support for chained samples
- Use ProcessedSampleBuffer instead of SampleBuffer for all passes in the ProfilerService. More cleanups here will follow.

R=rmacnak@google.com

Committed: https://github.com/dart-lang/sdk/commit/7f7fcf03ee1c86948dbc1766bf6cc0acb75608e8

[Cutch, 2015-06-23 22:01:05]

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

[rmacnak, 2015-06-23 22:38:55]

lgtm

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler.h
File runtime/vm/profiler.h (right):

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler.h#newco...
runtime/vm/profiler.h:465: intptr_t cid() const { return cid_; }
Consider 'allocation_cid'

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler_service.cc
File runtime/vm/profiler_service.cc (right):

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler_service...
runtime/vm/profiler_service.cc:20: DEFINE_FLAG(bool, trace_profiler, true,
"Trace profiler.");
Revert to false.

[Cutch, 2015-06-24 13:54:35]

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler.h
File runtime/vm/profiler.h (right):

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler.h#newco...
runtime/vm/profiler.h:465: intptr_t cid() const { return cid_; }
On 2015/06/23 22:38:54, rmacnak wrote:
> Consider 'allocation_cid'

Done.

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler_service.cc
File runtime/vm/profiler_service.cc (right):

https://codereview.chromium.org/1202943002/diff/1/runtime/vm/profiler_service...
runtime/vm/profiler_service.cc:20: DEFINE_FLAG(bool, trace_profiler, true,
"Trace profiler.");
On 2015/06/23 22:38:54, rmacnak wrote:
> Revert to false.

Done.

[Cutch, 2015-06-24 13:54:44]

Committed patchset #2 (id:20001) manually as
7f7fcf03ee1c86948dbc1766bf6cc0acb75608e8 (presubmit successful).