Revert 192670 "Use NTP time for video frame timestamp."

trunk/src/content/renderer/media/rtc_video_capturer.cc

Index: trunk/src/content/renderer/media/rtc_video_capturer.cc
===================================================================
--- trunk/src/content/renderer/media/rtc_video_capturer.cc	(revision 193357)
+++ trunk/src/content/renderer/media/rtc_video_capturer.cc	(working copy)
@@ -5,7 +5,6 @@
 #include "content/renderer/media/rtc_video_capturer.h"
 
 #include "base/bind.h"
-#include "base/debug/trace_event.h"
 
 namespace content {
 
@@ -16,17 +15,6 @@
     : is_screencast_(is_screencast),
       delegate_(new RtcVideoCaptureDelegate(id, vc_manager)),
       state_(VIDEO_CAPTURE_STATE_STOPPED) {
-  base::Time::Exploded exploded = {};
-  exploded.year = 1900;
-  exploded.month = 1;
-  exploded.day_of_week = 0;
-  exploded.day_of_month = 1;
-  exploded.hour = 0;
-  exploded.minute = 0;
-  exploded.second = 0;
-  exploded.millisecond = 0;
-  DCHECK(exploded.HasValidValues());
-  ntp_epoch_ = base::Time::FromUTCExploded(exploded);
 }
 
 RtcVideoCapturer::~RtcVideoCapturer() {
@@ -112,20 +100,11 @@
   // cricket::CapturedFrame time is in nanoseconds.
   frame.elapsed_time = (buf.timestamp - start_time_).InMicroseconds() *
       base::Time::kNanosecondsPerMicrosecond;
-  // Timestamp in NTP time (seconds since 0:00 UTC 1 January 1900) in ms.
-  frame.time_stamp = (buf.timestamp - ntp_epoch_).InMilliseconds();
+  frame.time_stamp = frame.elapsed_time;
   frame.data = buf.memory_pointer;
   frame.pixel_height = 1;
   frame.pixel_width = 1;
 
-  TRACE_EVENT_INSTANT2("rtc_video_capturer",
-                       "OnFrameCaptured",
-                       TRACE_EVENT_SCOPE_THREAD,
-                       "elapsed time",
-                       frame.elapsed_time,
-                       "timestamp",
-                       frame.time_stamp);
-
   // This signals to libJingle that a new VideoFrame is available.
   // libJingle have no assumptions on what thread this signal come from.
   SignalFrameCaptured(this, &frame);