123   struct CollectionContext {  struct in base::StackSamplingProfiler::SamplingThread
124     CollectionContext(PlatformThreadId thread_id,  in CollectionContext()  function
137     const int collection_id;
138     const PlatformThreadId thread_id;  // Thread id of the sampled thread.
140     const SamplingParams params;    // Information about how to sample.
142         finished;  // Signaled when all sampling complete.
145     std::unique_ptr<StackSampler> sampler;
148     TimeTicks next_sample_time;
151     TimeTicks profile_start_time;
154     int sample_count = 0;
157     bool stopping = false;
160     static AtomicSequenceNumber next_collection_id;