Revert "Switch profiler from isolates to threads"

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 1446 matching lines @@
   // TODO(16615): Validate isolate parameter.
   Isolate* iso = reinterpret_cast<Isolate*>(isolate);
   if (iso->HasMutatorThread()) {
     FATAL("Multiple mutators within one isolate is not supported.");
   }
   Thread::EnsureInit();
   Thread::EnterIsolate(iso);
 }
 
 
-DART_EXPORT void Dart_ThreadDisableProfiling() {
-  Thread* T = Thread::Current();
-  if (T == NULL) {
+DART_EXPORT void Dart_IsolateBlocked() {
+  Isolate* isolate = Isolate::Current();
+  CHECK_ISOLATE(isolate);
+  IsolateProfilerData* profiler_data = isolate->profiler_data();
+  if (profiler_data == NULL) {
     return;
   }
-  T->DisableThreadInterrupts();
+  profiler_data->Block();
 }
 
 
-DART_EXPORT void Dart_ThreadEnableProfiling() {
-  Thread* T = Thread::Current();
-  if (T == NULL) {
+DART_EXPORT void Dart_IsolateUnblocked() {
+  Isolate* isolate = Isolate::Current();
+  CHECK_ISOLATE(isolate);
+  IsolateProfilerData* profiler_data = isolate->profiler_data();
+  if (profiler_data == NULL) {
     return;
   }
-  T->EnableThreadInterrupts();
+  profiler_data->Unblock();
 }
 
 
 DART_EXPORT void Dart_ExitIsolate() {
   CHECK_ISOLATE(Isolate::Current());
   Thread::ExitIsolate();
 }
 
 
 // TODO(iposva): Remove this API and instead expose the underlying flags.
@@ skipping 4591 matching lines @@
                                    ApiReallocate);
   writer.WriteFullSnapshot();
   *vm_isolate_snapshot_size = writer.VmIsolateSnapshotSize();
   *isolate_snapshot_size = writer.IsolateSnapshotSize();
   *instructions_snapshot_size = writer.InstructionsSnapshotSize();
 
   return Api::Success();
 }
 
 }  // namespace dart