Change default timestamp to 64 bits in all webrtc directories.

BUG=
R=pbos@webrtc.org, pthatcher@webrtc.org, solenberg@webrtc.org

Review URL: https://codereview.webrtc.org/1835053002 .

Cr-Commit-Position: refs/heads/master@{#12646}

webrtc/base/timeutils.h

@@ -29,58 +29,40 @@ static const int64_t kNumNanosecsPerMillisec =
 static const int64_t kNumNanosecsPerMicrosec =
     kNumNanosecsPerSec / kNumMicrosecsPerSec;
 
-typedef uint32_t TimeStamp;
+// TODO(honghaiz): Define a type for the time value specifically.
 
 // Returns the current time in milliseconds in 32 bits.
 uint32_t Time32();
 
 // Returns the current time in milliseconds in 64 bits.
 int64_t TimeMillis();
-
-// Returns the current time in milliseconds.
-// TODO(honghaiz): Change to return TimeMillis() once majority of the webrtc
-// code migrates to 64-bit timestamp.
-inline uint32_t Time() {
-  return Time32();
+// Deprecated. Do not use this in any new code.
+inline int64_t Time() {
+  return TimeMillis();
 }
 
 // Returns the current time in microseconds.
 uint64_t TimeMicros();
+
 // Returns the current time in nanoseconds.
 uint64_t TimeNanos();
 
 // Returns a future timestamp, 'elapsed' milliseconds from now.
-uint32_t TimeAfter(int32_t elapsed);
-
-bool TimeIsLaterOrEqual(uint32_t earlier, uint32_t later);  // Inclusive
-bool TimeIsLater(uint32_t earlier, uint32_t later);         // Exclusive
-
-// Returns the later of two timestamps.
-inline uint32_t TimeMax(uint32_t ts1, uint32_t ts2) {
-  return TimeIsLaterOrEqual(ts1, ts2) ? ts2 : ts1;
-}
-
-// Returns the earlier of two timestamps.
-inline uint32_t TimeMin(uint32_t ts1, uint32_t ts2) {
-  return TimeIsLaterOrEqual(ts1, ts2) ? ts1 : ts2;
-}
+int64_t TimeAfter(int64_t elapsed);
 
 // Number of milliseconds that would elapse between 'earlier' and 'later'
 // 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);
+int64_t TimeDiff(int64_t later, int64_t earlier);
+int32_t TimeDiff32(uint32_t later, uint32_t earlier);
 
 // The number of milliseconds that have elapsed since 'earlier'.
-inline int32_t TimeSince(uint32_t earlier) {
-  return TimeDiff(Time(), earlier);
+inline int64_t TimeSince(int64_t earlier) {
+  return TimeMillis() - earlier;
 }
 
 // The number of milliseconds that will elapse between now and 'later'.
-inline int32_t TimeUntil(uint32_t later) {
-  return TimeDiff(later, Time());
+inline int64_t TimeUntil(uint64_t later) {
+  return later - TimeMillis();
 }
 
 class TimestampWrapAroundHandler {