Revert "Switch profiler from isolates to threads"

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 532 matching lines @@
   intptr_t UnblockClassFinalization() {
     ASSERT(defer_finalization_count_ > 0);
     return defer_finalization_count_--;
   }
 
   bool AllowClassFinalization() {
     ASSERT(defer_finalization_count_ >= 0);
     return defer_finalization_count_ == 0;
   }
 
+  Mutex* profiler_data_mutex() {
+    return &profiler_data_mutex_;
+  }
+
+  void set_profiler_data(IsolateProfilerData* profiler_data) {
+    profiler_data_ = profiler_data;
+  }
+
+  IsolateProfilerData* profiler_data() const {
+    return profiler_data_;
+  }
+
   void PrintJSON(JSONStream* stream, bool ref = true);
 
   CompilerStats* compiler_stats() {
     return compiler_stats_;
   }
 
+  // Returns the number of sampled threads.
+  intptr_t ProfileInterrupt();
+
   VMTagCounters* vm_tag_counters() {
     return &vm_tag_counters_;
   }
 
   uword user_tag() const {
     return user_tag_;
   }
   static intptr_t user_tag_offset() {
     return OFFSET_OF(Isolate, user_tag_);
   }
@@ skipping 205 matching lines @@
   // Timestamps of last operation via service.
   int64_t last_allocationprofile_accumulator_reset_timestamp_;
   int64_t last_allocationprofile_gc_timestamp_;
 
   // Ring buffer of objects assigned an id.
   ObjectIdRing* object_id_ring_;
 
   // Trace buffer support.
   TraceBuffer* trace_buffer_;
 
+  IsolateProfilerData* profiler_data_;
+  Mutex profiler_data_mutex_;
+
   VMTagCounters vm_tag_counters_;
   RawGrowableObjectArray* tag_table_;
 
   RawGrowableObjectArray* deoptimized_code_array_;
 
   // Background compilation.
   BackgroundCompiler* background_compiler_;
 
   // We use 6 list entries for each pending service extension calls.
   enum {
@@ skipping 177 matching lines @@
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   Isolate::Flags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_