Use faster clock_gettime() instead of sysctl() to get current ticks on iOS10

net/quic/platform/impl/quic_chromium_clock.cc

Index: net/quic/platform/impl/quic_chromium_clock.cc
diff --git a/net/quic/platform/impl/quic_chromium_clock.cc b/net/quic/platform/impl/quic_chromium_clock.cc
index fb591f842feffedc69d6145f50771c62b7e1ac14..2349cfce3c06b3cc822ea95841b6b60fc95fc034 100644
--- a/net/quic/platform/impl/quic_chromium_clock.cc
+++ b/net/quic/platform/impl/quic_chromium_clock.cc
@@ -4,12 +4,6 @@
 
 #include "net/quic/platform/impl/quic_chromium_clock.h"
 
-#if defined(OS_IOS)
-#include <time.h>
-
-#include "base/ios/ios_util.h"
-#endif
-
 #include "base/memory/singleton.h"
 #include "base/time/time.h"
 
@@ -29,15 +23,6 @@ QuicTime QuicChromiumClock::ApproximateNow() const {
 }
 
 QuicTime QuicChromiumClock::Now() const {
-#if defined(OS_IOS)
-  if (base::ios::IsRunningOnIOS10OrLater()) {
-    struct timespec tp;
-    if (clock_gettime(CLOCK_MONOTONIC, &tp) == 0) {
-      return CreateTimeFromMicroseconds(tp.tv_sec * 1000000 +
-                                        tp.tv_nsec / 1000);
-    }
-  }
-#endif
   return CreateTimeFromMicroseconds(base::TimeTicks::Now().ToInternalValue());

[miu, 2017/05/22 22:16:14]

Please fix: This is invalid use of ToInternalValue() (and ToInternalValue() is
deprecated). If you want an arbitrary tick count in a microsecond timebase, you
should make this:

  return CreateTimeFromMicroseconds(
      (base::TimeTicks::Now() - base::TimeTicks()).InMicroseconds());

More info: http://crbug.com/634507

[kapishnikov, 2017/05/23 17:56:51]

Done.

 }