Video/Screenshare loopback tool.

webrtc/system_wrappers/source/clock.cc

Index: webrtc/system_wrappers/source/clock.cc
diff --git a/webrtc/system_wrappers/source/clock.cc b/webrtc/system_wrappers/source/clock.cc
index f4533fb168f74adda8fa975a3e6f41a5a2a4de18..431a66fc14d5a18eb3b47ae17192726e0e35d170 100644
--- a/webrtc/system_wrappers/source/clock.cc
+++ b/webrtc/system_wrappers/source/clock.cc
@@ -19,10 +19,32 @@
 #include <time.h>
 #endif
 
+#include <sstream>
+
 #include "webrtc/rtc_base/criticalsection.h"
 #include "webrtc/rtc_base/timeutils.h"
 #include "webrtc/system_wrappers/include/rw_lock_wrapper.h"
 
+extern int64_t start_time;
+
+void Print(const char* fmt, ...) {
+  const static int kBufferSize = 5000;
+  char buffer[kBufferSize];
+  int64_t now_ms = webrtc::Clock::GetRealTimeClock()->TimeInMilliseconds();
+  if (start_time == -1)
+    start_time = now_ms;
+
+  int bytes_written;
+  bytes_written = snprintf(buffer, kBufferSize, "%8ld - ", now_ms - start_time);
+  va_list args;
+  va_start(args, fmt);
+  bytes_written +=
+      vsnprintf(buffer + bytes_written, kBufferSize - bytes_written, fmt, args);
+  assert(bytes_written < kBufferSize);
+  va_end(args);
+  printf("%s\n", buffer);
+}
+
 namespace webrtc {
 
 class RealTimeClock : public Clock {