Sketch DM refactor.

tools/timer/Timer.cpp

Index: tools/timer/Timer.cpp
diff --git a/tools/timer/Timer.cpp b/tools/timer/Timer.cpp
index a9f04afe756ea1cb3f01c8ea1958f16a51adc2b3..e430404b3d7836d622bb45d734b7c9a8a45420a0 100644
--- a/tools/timer/Timer.cpp
+++ b/tools/timer/Timer.cpp
@@ -51,3 +51,14 @@ void WallTimer::start() {
 void WallTimer::end() {
     fWall = fSysTimer.endWall();
 }
+
+SkString HumanizeMs(double ms) {
+    if (ms > 1e+3)     return SkStringPrintf("%.3gs",  ms/1e3);
+    if (ms < 1e-3)     return SkStringPrintf("%.3gns", ms*1e6);
+#ifdef SK_BUILD_FOR_WIN
+    if (ms < 1)        return SkStringPrintf("%.3gus", ms*1e3);
+#else
+    if (ms < 1)        return SkStringPrintf("%.3gµs", ms*1e3);
+#endif
+    return SkStringPrintf("%.3gms", ms);
+}