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/rtp_rtcp/source/rtcp_receiver.h b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
index 223da76..0301977 100644
--- a/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
+++ b/webrtc/modules/rtp_rtcp/source/rtcp_receiver.h
@@ -71,14 +71,14 @@
 
     // get rtt
     int32_t RTT(uint32_t remoteSSRC,
-                uint16_t* RTT,
-                uint16_t* avgRTT,
-                uint16_t* minRTT,
-                uint16_t* maxRTT) const;
+                int64_t* RTT,
+                int64_t* avgRTT,
+                int64_t* minRTT,
+                int64_t* maxRTT) const;
 
     int32_t SenderInfoReceived(RTCPSenderInfo* senderInfo) const;
 
-    bool GetAndResetXrRrRtt(uint16_t* rtt_ms);
+    bool GetAndResetXrRrRtt(int64_t* rtt_ms);
 
     // get statistics
     int32_t StatisticsReceived(
@@ -257,7 +257,7 @@
   uint32_t _lastReceivedXRNTPsecs;
   uint32_t _lastReceivedXRNTPfrac;
   // Estimated rtt, zero when there is no valid estimate.
-  uint16_t xr_rr_rtt_ms_;
+  int64_t xr_rr_rtt_ms_;
 
   // Received report blocks.
   ReportBlockMap _receivedReportBlockMap