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

talk/media/base/mediaengine.h

Index: talk/media/base/mediaengine.h
diff --git a/talk/media/base/mediaengine.h b/talk/media/base/mediaengine.h
index 43b4de5a52ddf8467def3ea4c77662057f0655e7..cd533c443ef0ae2c851e8140fc77cc230ac2fb0f 100644
--- a/talk/media/base/mediaengine.h
+++ b/talk/media/base/mediaengine.h
@@ -102,8 +102,10 @@ class MediaEngineInterface {
   virtual const std::vector<VideoCodec>& video_codecs() = 0;
   virtual RtpCapabilities GetVideoCapabilities() = 0;
 
-  // Starts AEC dump using existing file.
-  virtual bool StartAecDump(rtc::PlatformFile file) = 0;
+  // Starts AEC dump using existing file, a maximum file size in bytes can be
+  // specified. Logging is stopped just before the size limit is exceeded.
+  // If max_size_bytes is set to a value <= 0, no limit will be used.
+  virtual bool StartAecDump(rtc::PlatformFile file, int64_t max_size_bytes) = 0;
 
   // Stops recording AEC dump.
   virtual void StopAecDump() = 0;
@@ -185,8 +187,8 @@ class CompositeMediaEngine : public MediaEngineInterface {
     return video_.GetCapabilities();
   }
 
-  virtual bool StartAecDump(rtc::PlatformFile file) {
-    return voice_.StartAecDump(file);
+  virtual bool StartAecDump(rtc::PlatformFile file, int64_t max_size_bytes) {
+    return voice_.StartAecDump(file, max_size_bytes);
   }
 
   virtual void StopAecDump() {