Add shouldDisableBuffering to RTCFileLogger.

talk/app/webrtc/objc/public/RTCFileLogger.h

Index: talk/app/webrtc/objc/public/RTCFileLogger.h
diff --git a/talk/app/webrtc/objc/public/RTCFileLogger.h b/talk/app/webrtc/objc/public/RTCFileLogger.h
index 70b3825307145ea329ffe33706006ab49434cb56..af43f8ad27160a36270ba194dde972006db5eaeb 100644
--- a/talk/app/webrtc/objc/public/RTCFileLogger.h
+++ b/talk/app/webrtc/objc/public/RTCFileLogger.h
@@ -60,6 +60,10 @@ typedef NS_ENUM(NSUInteger, RTCFileLoggerRotationType) {
 // kRTCFileLoggerTypeCall.
 @property(nonatomic, readonly) RTCFileLoggerRotationType rotationType;
 
+// Disables buffering disk writes. Should be set before |start|. Buffering
+// is enabled by default for performance.
+@property(nonatomic, assign) BOOL shouldDisableBuffering;
+
 // Default constructor provides default settings for dir path, file size and
 // rotation type.
 - (instancetype)init;