Revert "Switch profiler from isolates to threads"

runtime/include/dart_api.h

 /*
  * Copyright (c) 2012, 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.
  */
 
 #ifndef INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
@@ skipping 1009 matching lines @@
 /**
  * Enters an isolate. After calling this function,
  * the current isolate will be set to the provided isolate.
  *
  * Requires there to be no current isolate. Multiple threads may not be in
  * the same isolate at once.
  */
 DART_EXPORT void Dart_EnterIsolate(Dart_Isolate isolate);
 
 /**
- * Notifies the VM that the current thread should not be profiled until a
- * matching call to Dart_ThreadEnableProfiling is made.
- *
- * NOTE: By default, if a thread has entered an isolate it will be profiled.
- * This function should be used when an embedder knows a thread is about
- * to make a blocking call and wants to avoid unnecessary interrupts by
- * the profiler.
+ * Notifies the VM that the current isolate is about to make a blocking call.
  */
-DART_EXPORT void Dart_ThreadDisableProfiling();
+DART_EXPORT void Dart_IsolateBlocked();
 
 /**
- * Notifies the VM that the current thread should be profiled.
- *
- * NOTE: It is only legal to call this function *after* calling
- *   Dart_ThreadDisableProfiling.
- *
- * NOTE: By default, if a thread has entered an isolate it will be profiled.
+ * Notifies the VM that the current isolate is no longer blocked.
  */
-DART_EXPORT void Dart_ThreadEnableProfiling();
+DART_EXPORT void Dart_IsolateUnblocked();
 
 /**
  * Exits an isolate. After this call, Dart_CurrentIsolate will
  * return NULL.
  *
  * Requires there to be a current isolate.
  */
 DART_EXPORT void Dart_ExitIsolate();
 /* TODO(turnidge): We don't want users of the api to be able to exit a
  * "pure" dart isolate. Implement and document. */
@@ skipping 1904 matching lines @@
 
 DART_EXPORT Dart_Handle Dart_CreatePrecompiledSnapshot(
     uint8_t** vm_isolate_snapshot_buffer,
     intptr_t* vm_isolate_snapshot_size,
     uint8_t** isolate_snapshot_buffer,
     intptr_t* isolate_snapshot_size,
     uint8_t** instructions_snapshot_buffer,
     intptr_t* instructions_snapshot_size);
 
 #endif  /* INCLUDE_DART_API_H_ */  /* NOLINT */