Fuchsia: Enable newly working socket tests; use MX_CLOCK_UTC.

runtime/vm/os_fuchsia.cc

 // Copyright (c) 2016, 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "vm/os.h"
 
 #include <errno.h>
 #include <magenta/syscalls.h>
 #include <magenta/types.h>
-#include <sys/time.h>
 
 #include "platform/assert.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 #ifndef PRODUCT
 
 DEFINE_FLAG(bool,
             generate_perf_events_symbols,
@@ skipping 47 matching lines @@
   return static_cast<int>(-timezone);
 }
 
 
 int64_t OS::GetCurrentTimeMillis() {
   return GetCurrentTimeMicros() / 1000;
 }
 
 
 int64_t OS::GetCurrentTimeMicros() {
-  struct timeval tv;
-  if (gettimeofday(&tv, NULL) < 0) {
-    UNREACHABLE();
-    return 0;
-  }
-  return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
+  return mx_time_get(MX_CLOCK_UTC) / kNanosecondsPerMicrosecond;
 }
 
 
 int64_t OS::GetCurrentMonotonicTicks() {
   return mx_time_get(MX_CLOCK_MONOTONIC);
 }
 
 
 int64_t OS::GetCurrentMonotonicFrequency() {
   return kNanosecondsPerSecond;
@@ skipping 215 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)