Android: Add common function for adding/releasing native reference

webrtc/sdk/android/src/jni/jni_helpers.cc

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include "webrtc/sdk/android/src/jni/jni_helpers.h"
 
-#include "webrtc/sdk/android/src/jni/classreferenceholder.h"
-
 #include <asm/unistd.h>
 #include <sys/prctl.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 #include <vector>
 
+#include "webrtc/sdk/android/src/jni/classreferenceholder.h"
+
 namespace webrtc_jni {
 
 static JavaVM* g_jvm = nullptr;
 
 static pthread_once_t g_jni_ptr_once = PTHREAD_ONCE_INIT;
 
 // Key for per-thread JNIEnv* data.  Non-NULL in threads attached to |g_jvm| by
 // AttachCurrentThreadIfNeeded(), NULL in unattached threads and threads that
 // were attached by the JVM because of a Java->native call.
 static pthread_key_t g_jni_ptr;
@@ skipping 349 matching lines @@
   RTC_CHECK(!AtEnd());
   return value_;
 }
 
 bool Iterable::Iterator::AtEnd() const {
   RTC_CHECK(thread_checker_.CalledOnValidThread());
   return jni_ == nullptr || IsNull(jni_, iterator_);
 }
 
 }  // namespace webrtc_jni