Include thread CPU time in Timeline

runtime/vm/os_thread_linux.cc

Index: runtime/vm/os_thread_linux.cc
diff --git a/runtime/vm/os_thread_linux.cc b/runtime/vm/os_thread_linux.cc
index ffcd2e67368d4c7bc4dc53acc956b07a8250fc5b..4c048541f798cba1f6c1e7c0f9a2cabc2d67882a 100644
--- a/runtime/vm/os_thread_linux.cc
+++ b/runtime/vm/os_thread_linux.cc
@@ -221,17 +221,6 @@ bool OSThread::Compare(ThreadId a, ThreadId b) {
 }
 
 
-void OSThread::GetThreadCpuUsage(ThreadId thread_id, int64_t* cpu_usage) {
-  ASSERT(thread_id == GetCurrentThreadId());
-  ASSERT(cpu_usage != NULL);
-  struct timespec ts;
-  int r = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
-  ASSERT(r == 0);
-  *cpu_usage = (ts.tv_sec * kNanosecondsPerSecond + ts.tv_nsec) /
-               kNanosecondsPerMicrosecond;
-}
-
-
 Mutex::Mutex() {
   pthread_mutexattr_t attr;
   int result = pthread_mutexattr_init(&attr);