Using 64-bit timestamp in webrtc/p2p

webrtc/base/timeutils.h

Index: webrtc/base/timeutils.h
diff --git a/webrtc/base/timeutils.h b/webrtc/base/timeutils.h
index 3ade43094708c92e02e075522a4da151b7712059..c134179d534a46ec2ed2bc121596c4300ab075f2 100644
--- a/webrtc/base/timeutils.h
+++ b/webrtc/base/timeutils.h
@@ -36,6 +36,10 @@ typedef uint32_t TimeStamp;
 
 // Returns the current time in milliseconds.
 uint32_t Time();

[pthatcher1, 2016/03/15 04:10:50]

Can you make a Time32() that chooses 32-bit time, and then make Time() call
Time32() for now, but then later change the remaining callers of Time() to be
Time32(), and then change Time() to call Time64()?

And can you also put a TODO here saying that's what you are going to do?  That
way, we'll eventually be in a state where everything can call Time() with the
right size, and only get 32-bit if it asks for it with Time32().

In fact, we should probably go back and rename all the calls to Time64() to be
Time() as well. 

[honghaiz3, 2016/03/15 17:35:33]

Done. The last item will be done in the next CL when we switch the default from
32bit to 64bit time. 

+
+// Returns the current time in milliseconds.
+int64_t Time64();
+
 // Returns the current time in microseconds.
 uint64_t TimeMicros();
 // Returns the current time in nanoseconds.
@@ -68,6 +72,10 @@ inline uint32_t TimeMin(uint32_t ts1, uint32_t ts2) {
 // timestamps.  The value is negative if 'later' occurs before 'earlier'.
 int32_t TimeDiff(uint32_t later, uint32_t earlier);
 
+// Number of milliseconds that would elapse between 'earlier' and 'later'
+// timestamps.  The value is negative if 'later' occurs before 'earlier'.
+int64_t TimeDiff64(int64_t later, int64_t earlier);

[pthatcher1, 2016/03/15 04:10:50]

Same here with the names: make TimeDiff64 the default and 32 the strange one.

[honghaiz3, 2016/03/15 17:35:33]

Will do this in the next CL because many of the 32-bit methods including
TimeDiff may be removed at all (The implementation is extremely simple. The only
reason to keep them is to support the legacy call).

+
 // The number of milliseconds that have elapsed since 'earlier'.
 inline int32_t TimeSince(uint32_t earlier) {
   return TimeDiff(Time(), earlier);