Reland "Added option to specify a maximum file size when recording an AEC dump."

talk/session/media/channelmanager.h

Index: talk/session/media/channelmanager.h
diff --git a/talk/session/media/channelmanager.h b/talk/session/media/channelmanager.h
index 2bc516bfaa36edfdb075795be10cec74583d1a7b..f69bf9a2935c2a25bca79a555e2e3e49a4118031 100644
--- a/talk/session/media/channelmanager.h
+++ b/talk/session/media/channelmanager.h
@@ -162,8 +162,10 @@ class ChannelManager : public rtc::MessageHandler,
 
   // The operations below occur on the main thread.
 
-  // Starts AEC dump using existing file.
-  bool StartAecDump(rtc::PlatformFile file);
+  // Starts AEC dump using existing file, with a specified maximum file size in
+  // bytes. When the limit is reached, logging will stop and the file will be
+  // closed. If max_size_bytes is set to <= 0, no limit will be used.
+  bool StartAecDump(rtc::PlatformFile file, int64_t max_size_bytes);
 
   // Stops recording AEC dump.
   void StopAecDump();