Revert of SkTime::GetNSecs() (patchset #10 id:180001 of https://codereview.chromium.org/1422513003/ )

Reason for revert:
https://codereview.chromium.org/1412453006

Original issue's description:
> SkTime::GetNSecs()
>
>    - Move high-precision wall timers from tools/timer to SkTime.
>    - Implement SkTime::GetMSecs() in terms of SkTime::GetNSecs().
>    - Delete unused tools/timer code.
>
> I have no idea what's going on there in src/animator.
> I don't intend to investigate.
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/70084cbc16ee8162649f2601377feb6e49de0217
>
> CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Debug-CrOS_Link-Trybot
>
> Committed: https://skia.googlesource.com/skia/+/a1840d50e29fd95e4df2d1168fe54c34c2a5c30c

TBR=caryclark@google.com,reed@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1417753003

2 files changed, 18 insertions, 0 deletions

diff --git a/src/ports/SkTime_Unix.cpp b/src/ports/SkTime_Unix.cpp
index 1ea3b8fbd0..ec96bb8a90 100644
--- a/src/ports/SkTime_Unix.cpp
+++ b/src/ports/SkTime_Unix.cpp
@@ -34,3 +34,10 @@ void SkTime::GetDateTime(DateTime* dt)
         dt->fSecond     = SkToU8(tstruct->tm_sec);
     }
 }
+
+SkMSec SkTime::GetMSecs()
+{
+    struct timeval tv;
+    gettimeofday(&tv, nullptr);
+    return (SkMSec) (tv.tv_sec * 1000 + tv.tv_usec / 1000 ); // microseconds to milliseconds
+}
diff --git a/src/ports/SkTime_win.cpp b/src/ports/SkTime_win.cpp
index 2bd5062c3c..19f4695a86 100644
--- a/src/ports/SkTime_win.cpp
+++ b/src/ports/SkTime_win.cpp
@@ -39,3 +39,14 @@ void SkTime::GetDateTime(DateTime* dt)
         dt->fSecond     = SkToU8(st.wSecond);
     }
 }
+
+SkMSec SkTime::GetMSecs()
+{
+    FILETIME        ft;
+    LARGE_INTEGER   li;
+    GetSystemTimeAsFileTime(&ft);
+    li.LowPart  = ft.dwLowDateTime;
+    li.HighPart = ft.dwHighDateTime;
+    __int64 t  = li.QuadPart;       /* In 100-nanosecond intervals */
+    return (SkMSec)(t / 10000);               /* In milliseconds */
+}