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

1 files changed, 46 insertions, 0 deletions

diff --git a/tools/timer/Timer.cpp b/tools/timer/Timer.cpp
index 28841cdc84..b59988ca26 100644
--- a/tools/timer/Timer.cpp
+++ b/tools/timer/Timer.cpp
@@ -6,6 +6,52 @@
  */
 #include "Timer.h"
 
+Timer::Timer(SkGLContext* gl)
+        : fCpu(-1.0)
+        , fWall(-1.0)
+        , fTruncatedCpu(-1.0)
+        , fTruncatedWall(-1.0)
+        , fGpu(-1.0)
+#if SK_SUPPORT_GPU
+        , fGpuTimer(gl)
+#endif
+        {}
+
+void Timer::start() {
+    fSysTimer.startWall();
+    fTruncatedSysTimer.startWall();
+#if SK_SUPPORT_GPU
+    fGpuTimer.start();
+#endif
+    fSysTimer.startCpu();
+    fTruncatedSysTimer.startCpu();
+}
+
+void Timer::end() {
+    fCpu = fSysTimer.endCpu();
+#if SK_SUPPORT_GPU
+    //It is important to stop the cpu clocks first,
+    //as the following will cpu wait for the gpu to finish.
+    fGpu = fGpuTimer.end();
+#endif
+    fWall = fSysTimer.endWall();
+}
+
+void Timer::truncatedEnd() {
+    fTruncatedCpu = fTruncatedSysTimer.endCpu();
+    fTruncatedWall = fTruncatedSysTimer.endWall();
+}
+
+WallTimer::WallTimer() : fWall(-1.0) {}
+
+void WallTimer::start() {
+    fSysTimer.startWall();
+}
+
+void WallTimer::end() {
+    fWall = fSysTimer.endWall();
+}
+
 SkString HumanizeMs(double ms) {
     if (ms > 60e+3)  return SkStringPrintf("%.3gm", ms/60e+3);
     if (ms >  1e+3)  return SkStringPrintf("%.3gs",  ms/1e+3);