Switch profiler from isolates to threads [second landing]

runtime/vm/thread_interrupter_android.cc

Index: runtime/vm/thread_interrupter_android.cc
diff --git a/runtime/vm/thread_interrupter_android.cc b/runtime/vm/thread_interrupter_android.cc
index 5c4092dbe8c54ad6e69c34a53efdd6edcf70f917..1c780bab680722ed8b34cd50896d17de8296a8c8 100644
--- a/runtime/vm/thread_interrupter_android.cc
+++ b/runtime/vm/thread_interrupter_android.cc
@@ -6,9 +6,11 @@
 #if defined(TARGET_OS_ANDROID)
 
 #include <sys/syscall.h>  // NOLINT
+#include <errno.h>  // NOLINT
 
 #include "vm/flags.h"
 #include "vm/os.h"
+#include "vm/profiler.h"
 #include "vm/signal_handler.h"
 #include "vm/thread_interrupter.h"
 
@@ -28,22 +30,16 @@ class ThreadInterrupterAndroid : public AllStatic {
     if (thread == NULL) {
       return;
     }
-    ThreadInterruptCallback callback = NULL;
-    void* callback_data = NULL;
-    if (!thread->IsThreadInterrupterEnabled(&callback, &callback_data)) {
-      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);
+    Profiler::SampleThread(thread, its);
   }
 };
 
@@ -54,7 +50,7 @@ void ThreadInterrupter::InterruptThread(Thread* thread) {
               reinterpret_cast<void*>(thread->id()));
   }
   int result = syscall(__NR_tgkill, getpid(), thread->id(), SIGPROF);
-  ASSERT(result == 0);
+  ASSERT((result == 0) || (result == ESRCH));
 }