Fix Mac build

runtime/vm/timeline.cc

 // 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 PRODUCT
 
 #include <errno.h>
 #include <fcntl.h>
 #include <cstdlib>
 
@@ skipping 1382 matching lines @@
 
 
 void TimelineEventFixedBufferRecorder::CompleteEvent(TimelineEvent* event) {
   if (event == NULL) {
     return;
   }
   ThreadBlockCompleteEvent(event);
 }
 
 
-static const char* kSystracePath = "/sys/kernel/debug/tracing/trace_marker";
-
-
 TimelineEventSystraceRecorder::TimelineEventSystraceRecorder(intptr_t capacity)
     : TimelineEventFixedBufferRecorder(capacity),
       systrace_fd_(-1) {
 #if defined(TARGET_OS_ANDROID) || defined(TARGET_OS_LINUX)
+  const char* kSystracePath = "/sys/kernel/debug/tracing/trace_marker";
   systrace_fd_ = open(kSystracePath, O_WRONLY);
   if ((systrace_fd_ < 0) && FLAG_trace_timeline) {
     OS::PrintErr("TimelineEventSystraceRecorder: Could not open `%s`\n",
                  kSystracePath);
   }
 #else
   OS::PrintErr("Warning: The systrace timeline recorder is equivalent to the"
                "ring recorder on this platform.");
 #endif
 }
@@ skipping 377 matching lines @@
 TimelineEventBlock* TimelineEventBlockIterator::Next() {
   ASSERT(current_ != NULL);
   TimelineEventBlock* r = current_;
   current_ = current_->next();
   return r;
 }
 
 }  // namespace dart
 
 #endif  // !PRODUCT