Change default timestamp to 64 bits in all webrtc directories.

webrtc/media/base/rtpdump.h

Index: webrtc/media/base/rtpdump.h
diff --git a/webrtc/media/base/rtpdump.h b/webrtc/media/base/rtpdump.h
index 4ce479277afd193beabb32755595d71652f19977..6725f5492564cde29fcf079e5031a8abc582bd0c 100644
--- a/webrtc/media/base/rtpdump.h
+++ b/webrtc/media/base/rtpdump.h
@@ -39,7 +39,7 @@ enum RtpDumpPacketFilter {
 };
 
 struct RtpDumpFileHeader {
-  RtpDumpFileHeader(uint32_t start_ms, uint32_t s, uint16_t p);
+  RtpDumpFileHeader(int64_t start_ms, uint32_t s, uint16_t p);
   void WriteToByteBuffer(rtc::ByteBufferWriter* buf);
 
   static const char kFirstLine[];
@@ -112,7 +112,7 @@ class RtpDumpReader {
   rtc::StreamInterface* stream_;
   bool file_header_read_;
   size_t first_line_and_file_header_len_;
-  uint32_t start_time_ms_;
+  int64_t start_time_ms_;
   uint32_t ssrc_override_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(RtpDumpReader);
@@ -158,10 +158,10 @@ class RtpDumpLoopReader : public RtpDumpReader {
   // the previous dump packets in the input stream.
   uint32_t first_elapsed_time_;
   int first_rtp_seq_num_;
-  uint32_t first_rtp_timestamp_;
+  int64_t first_rtp_timestamp_;
   uint32_t prev_elapsed_time_;
   int prev_rtp_seq_num_;
-  uint32_t prev_rtp_timestamp_;
+  int64_t prev_rtp_timestamp_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(RtpDumpLoopReader);
 };