Switch profiler from isolates to threads

runtime/vm/thread_interrupter_macos.cc

Index: runtime/vm/thread_interrupter_macos.cc
diff --git a/runtime/vm/thread_interrupter_macos.cc b/runtime/vm/thread_interrupter_macos.cc
index f1ff45ee5fc0ae2336e79ca5e868e70345fa9f02..5a2ef9c1faeb2d3c964cdefc0552d96541275020 100644
--- a/runtime/vm/thread_interrupter_macos.cc
+++ b/runtime/vm/thread_interrupter_macos.cc
@@ -5,6 +5,8 @@
 #include "platform/globals.h"
 #if defined(TARGET_OS_MACOS)
 
+#include <errno.h>  // NOLINT
+
 #include "vm/flags.h"
 #include "vm/os.h"
 #include "vm/signal_handler.h"
@@ -27,21 +29,19 @@ class ThreadInterrupterMacOS : public AllStatic {
       return;
     }
     ThreadInterruptCallback callback = NULL;
-    void* callback_data = NULL;
-    if (!thread->IsThreadInterrupterEnabled(&callback, &callback_data)) {
+    if (!thread->GetThreadInterruptCallback(&callback)) {
       return;
     }
     // Extract thread state.
     ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
     mcontext_t mcontext = context->uc_mcontext;
     InterruptedThreadState its;
-    its.tid = thread->id();
     its.pc = SignalHandler::GetProgramCounter(mcontext);
     its.fp = SignalHandler::GetFramePointer(mcontext);
     its.csp = SignalHandler::GetCStackPointer(mcontext);
     its.dsp = SignalHandler::GetDartStackPointer(mcontext);
     its.lr = SignalHandler::GetLinkRegister(mcontext);
-    callback(its, callback_data);
+    callback(thread, its);
   }
 };
 
@@ -51,7 +51,7 @@ void ThreadInterrupter::InterruptThread(Thread* thread) {
     OS::Print("ThreadInterrupter interrupting %p\n", thread->id());
   }
   int result = pthread_kill(thread->id(), SIGPROF);
-  ASSERT(result == 0);
+  ASSERT((result == 0) || (result == ESRCH));
 }