Switch profiler from isolates to threads

runtime/vm/profiler_service.cc

Index: runtime/vm/profiler_service.cc
diff --git a/runtime/vm/profiler_service.cc b/runtime/vm/profiler_service.cc
index 64197073f9373f1d4a39df5e699f7959b845a972..39f863bbc6bfe7177f7875e97ef83a70cfd77520 100644
--- a/runtime/vm/profiler_service.cc
+++ b/runtime/vm/profiler_service.cc
@@ -1051,12 +1051,7 @@ class ProfileBuilder : public ValueObject {
 
   void FilterSamples() {
     ScopeTimer sw("ProfileBuilder::FilterSamples", FLAG_trace_profiler);
-    MutexLocker profiler_data_lock(isolate_->profiler_data_mutex());
-    IsolateProfilerData* profiler_data = isolate_->profiler_data();
-    if (profiler_data == NULL) {
-      return;
-    }
-    SampleBuffer* sample_buffer = profiler_data->sample_buffer();
+    SampleBuffer* sample_buffer = Profiler::sample_buffer();
     if (sample_buffer == NULL) {
       return;
     }
@@ -2203,13 +2198,10 @@ void ProfilerService::PrintJSONImpl(Thread* thread,
   // Disable profile interrupts while processing the buffer.
   Profiler::EndExecution(isolate);
 
-  {
-    MutexLocker profiler_data_lock(isolate->profiler_data_mutex());
-    IsolateProfilerData* profiler_data = isolate->profiler_data();
-    if (profiler_data == NULL) {
-      stream->PrintError(kFeatureDisabled, NULL);
-      return;
-    }
+  SampleBuffer* sample_buffer = Profiler::sample_buffer();
+  if (sample_buffer == NULL) {
+    stream->PrintError(kFeatureDisabled, NULL);
+    return;
   }
 
   {
@@ -2281,13 +2273,10 @@ void ProfilerService::ClearSamples() {
   // Disable profile interrupts while processing the buffer.
   Profiler::EndExecution(isolate);
 
-  MutexLocker profiler_data_lock(isolate->profiler_data_mutex());
-  IsolateProfilerData* profiler_data = isolate->profiler_data();
-  if (profiler_data == NULL) {
+  SampleBuffer* sample_buffer = Profiler::sample_buffer();
+  if (sample_buffer == NULL) {
     return;
   }
-  SampleBuffer* sample_buffer = profiler_data->sample_buffer();
-  ASSERT(sample_buffer != NULL);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);