Using 64-bit timestamp in webrtc/p2p

webrtc/base/timeutils_unittest.cc

Index: webrtc/base/timeutils_unittest.cc
diff --git a/webrtc/base/timeutils_unittest.cc b/webrtc/base/timeutils_unittest.cc
index 7e342d00fa14f766ec3da0a390b30415d85ff59a..636c408220d0e7ef1e11afd713883261b1c44532 100644
--- a/webrtc/base/timeutils_unittest.cc
+++ b/webrtc/base/timeutils_unittest.cc
@@ -144,6 +144,14 @@ TEST(TimeTest, DISABLED_CurrentTmTime) {
   EXPECT_TRUE(0 <= microseconds && microseconds < 1000000);
 }
 
+TEST(TimeTest, TestTimeDiff64) {
+  int64_t ts_diff = 100;
+  int64_t ts_earlier = rtc::Time64();
+  int64_t ts_later = ts_earlier + ts_diff;
+  EXPECT_EQ(ts_diff, rtc::TimeDiff(ts_later, ts_earlier));
+  EXPECT_EQ(-ts_diff, rtc::TimeDiff(ts_earlier, ts_later));
+}
+
 class TimestampWrapAroundHandlerTest : public testing::Test {
  public:
   TimestampWrapAroundHandlerTest() {}