Enable SecureSocket on Fuchsia using BoringSSL

runtime/vm/os_fuchsia.cc

Index: runtime/vm/os_fuchsia.cc
diff --git a/runtime/vm/os_fuchsia.cc b/runtime/vm/os_fuchsia.cc
index d6b96711ecefe0f88524d577b8b5892adc291ed5..6c13dde3a4e243f2373027fcf5d1f5f230a6fe8c 100644
--- a/runtime/vm/os_fuchsia.cc
+++ b/runtime/vm/os_fuchsia.cc
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <magenta/syscalls.h>
 #include <magenta/types.h>
+#include <sys/time.h>
 
 #include "platform/assert.h"
 #include "vm/zone.h"
@@ -77,7 +78,12 @@ int64_t OS::GetCurrentTimeMillis() {
 
 
 int64_t OS::GetCurrentTimeMicros() {
-  return mx_time_get(MX_CLOCK_MONOTONIC) / 1000;
+  struct timeval tv;
+  if (gettimeofday(&tv, NULL) < 0) {
+    UNREACHABLE();
+    return 0;
+  }
+  return (static_cast<int64_t>(tv.tv_sec) * 1000000) + tv.tv_usec;
 }