- Write the coverage data to a file instead of printing to stdout.

runtime/vm/os_win.cc

Index: runtime/vm/os_win.cc
===================================================================
--- runtime/vm/os_win.cc	(revision 27712)
+++ runtime/vm/os_win.cc	(working copy)
@@ -9,6 +9,7 @@
 #include "vm/vtune.h"
 
 #include <malloc.h>  // NOLINT
+#include <process.h>  // NOLINT
 #include <time.h>  // NOLINT
 
 #include "platform/utils.h"
@@ -21,6 +22,11 @@
 }
 
 
+intptr_t OS::ProcessId() {
+  return static_cast<intptr_t>(GetCurrentProcessId());
+}
+
+
 // As a side-effect sets the globals _timezone, _daylight and _tzname.
 static bool LocalTime(int64_t seconds_since_epoch, tm* tm_result) {
   time_t seconds = static_cast<time_t>(seconds_since_epoch);