Replace RoundMicrosecondsTo* utility.

runtime/platform/globals.h

Index: runtime/platform/globals.h
===================================================================
--- runtime/platform/globals.h	(revision 33466)
+++ runtime/platform/globals.h	(working copy)
@@ -326,13 +326,13 @@
                                    kMicrosecondsPerSecond);
 
 // Helpers to round micro second times to human understandable values.
-inline double RoundMicrosecondsToSeconds(int64_t micros) {
+inline int64_t RoundMicrosecondsToSeconds(int64_t micros) {

[Ivan Posva, 2014/03/10 13:00:36]

We should keep these as double and drop the rounding. It was an error trying to
round after deciding to use doubles.

   const int k1M = 1000000;  // Converting us to secs.
-  return static_cast<double>(micros + (k1M >> 1)) / k1M;
+  return (micros + (k1M >> 1)) / k1M;
 }
-inline double RoundMicrosecondsToMilliseconds(int64_t micros) {
-  const int k1K = 1000;  // Conversting us to ms.
-  return static_cast<double>(micros + (k1K >> 1)) / k1K;
+inline int64_t RoundMicrosecondsToMilliseconds(int64_t micros) {

[Ivan Posva, 2014/03/10 13:00:36]

ditto.

+  const int k1K = 1000;  // Converting us to ms.
+  return (micros + (k1K >> 1)) / k1K;
 }
 
 // A macro to disallow the copy constructor and operator= functions.