passing |buffer| by reference in AndroidVideoCapturer::OnIncomingFrame

talk/app/webrtc/java/jni/androidvideocapturer_jni.h

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 53 matching lines @@
                       const NativeTextureHandleImpl& handle);
   void OnOutputFormatRequest(int width, int height, int fps);
 
  protected:
   ~AndroidVideoCapturerJni();
 
  private:
   void ReturnBuffer(int64_t time_stamp);
   JNIEnv* jni();
 
+  // To avoid deducing Args from the 3rd parameter of AsyncCapturerInvoke

[magjed_webrtc, 2015/10/20 15:39:26]

nit: You should have a dot '.' at the of the sentence.

+  template <typename T>
+  struct Identity {
+    typedef T type;
+  };
+
   // Helper function to make safe asynchronous calls to |capturer_|. The calls
   // are not guaranteed to be delivered.
   template <typename... Args>
   void AsyncCapturerInvoke(
       const char* method_name,
       void (webrtc::AndroidVideoCapturer::*method)(Args...),
-      Args... args);
+      typename Identity<Args>::type... args);
 
   const ScopedGlobalRef<jobject> j_capturer_global_;
   const ScopedGlobalRef<jclass> j_video_capturer_class_;
   const ScopedGlobalRef<jclass> j_observer_class_;
 
   rtc::ThreadChecker thread_checker_;
 
   // |capturer| is a guaranteed to be a valid pointer between a call to
   // AndroidVideoCapturerDelegate::Start
   // until AndroidVideoCapturerDelegate::Stop.
   rtc::CriticalSection capturer_lock_;
   webrtc::AndroidVideoCapturer* capturer_ GUARDED_BY(capturer_lock_);
   // |invoker_| is used to communicate with |capturer_| on the thread Start() is
   // called on.
   rtc::scoped_ptr<rtc::GuardedAsyncInvoker> invoker_ GUARDED_BY(capturer_lock_);
 
   static jobject application_context_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(AndroidVideoCapturerJni);
 };
 
 }  // namespace webrtc_jni
 
 #endif  // TALK_APP_WEBRTC_JAVA_JNI_ANDROIDVIDEOCAPTURER_JNI_H_