Switch profiler from isolates to threads

runtime/vm/thread.h

 // Copyright (c) 2015, 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 VM_THREAD_H_
 #define VM_THREAD_H_
 
 #include "vm/globals.h"
 #include "vm/handles.h"
 #include "vm/os_thread.h"
@@ skipping 353 matching lines @@
   }
   static intptr_t vm_tag_offset() {
     return OFFSET_OF(Thread, vm_tag_);
   }
 
   ThreadId id() const {
     ASSERT(id_ != OSThread::kInvalidThreadId);
     return id_;
   }
 
+  // Used to temporarily disable or enable thread interrupts.
+  void DisableThreadInterrupts();
+  void EnableThreadInterrupts();
+  bool ThreadInterruptsEnabled();
+
   void SetThreadInterrupter(ThreadInterruptCallback callback, void* data);
 
   bool IsThreadInterrupterEnabled(ThreadInterruptCallback* callback,
                                   void** data) const;
 
 #if defined(DEBUG)
 #define REUSABLE_HANDLE_SCOPE_ACCESSORS(object)                                \
   void set_reusable_##object##_handle_scope_active(bool value) {               \
     reusable_##object##_handle_scope_active_ = value;                          \
   }                                                                            \
@@ skipping 26 matching lines @@
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
  private:
   template<class T> T* AllocateReusableHandle();
 
   static ThreadLocalKey thread_key_;
 
   const ThreadId id_;
   ThreadInterruptCallback thread_interrupt_callback_;
   void* thread_interrupt_data_;
+  uintptr_t thread_interrupt_disabled_;
   Isolate* isolate_;
   Heap* heap_;
   State state_;
   Mutex timeline_block_lock_;
   TimelineEventBlock* timeline_block_;
   StoreBufferBlock* store_buffer_block_;
   class Log* log_;
 #define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
   type_name member_name;
 CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
@@ skipping 98 matching lines @@
 };
 
 #if defined(TARGET_OS_WINDOWS)
 // Clears the state of the current thread and frees the allocation.
 void WindowsThreadCleanUp();
 #endif
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_