Use int64_t more consistently for times, in particular for RTT values.

Existing code was inconsistent about whether to use uint16_t, int, unsigned int,
or uint32_t, and sometimes silently truncated one to another, or truncated
int64_t.  Because most core time-handling functions use int64_t, being
consistent about using int64_t unless otherwise necessary minimizes the number
of explicit or implicit casts.

BUG=chromium:81439
TEST=none
R=henrik.lundin@webrtc.org, holmer@google.com, tommi@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/31349004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@8045 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/video_coding/main/source/receiver.cc b/webrtc/modules/video_coding/main/source/receiver.cc
index e1a4e2f..c84d992 100644
--- a/webrtc/modules/video_coding/main/source/receiver.cc
+++ b/webrtc/modules/video_coding/main/source/receiver.cc
@@ -59,7 +59,7 @@
   return VCM_OK;
 }
 
-void VCMReceiver::UpdateRtt(uint32_t rtt) {
+void VCMReceiver::UpdateRtt(int64_t rtt) {
   jitter_buffer_.UpdateRtt(rtt);
 }
 
@@ -191,8 +191,8 @@
 }
 
 void VCMReceiver::SetNackMode(VCMNackMode nackMode,
-                              int low_rtt_nack_threshold_ms,
-                              int high_rtt_nack_threshold_ms) {
+                              int64_t low_rtt_nack_threshold_ms,
+                              int64_t high_rtt_nack_threshold_ms) {
   CriticalSectionScoped cs(crit_sect_);
   // Default to always having NACK enabled in hybrid mode.
   jitter_buffer_.SetNackMode(nackMode, low_rtt_nack_threshold_ms,