Create an experimental Android NDK.

Following files were split:
sdk/android/native_api/jni_helpers.h
  -> sdk/android/native_api/jni/java_types.h
sdk/android/native_api/jni_helpers.cc
  -> sdk/android/native_api/jni/java_types.cc

Skipping presubmit to avoid changing moved code.

Bug: webrtc:8769

Change-Id: I0ef0f6b297b5002322915660d26cca33e91ff05b
No-Presubmit: true
Reviewed-on: https://webrtc-review.googlesource.com/40800
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21799}

sdk/android/native_api/codecs/wrapper.cc

@@ -0,0 +1,33 @@
+/*
+ *  Copyright 2018 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 "sdk/android/native_api/codecs/wrapper.h"
+
+#include "rtc_base/ptr_util.h"
+#include "sdk/android/src/jni/videodecoderfactorywrapper.h"
+#include "sdk/android/src/jni/videoencoderfactorywrapper.h"
+
+namespace webrtc {
+
+std::unique_ptr<VideoDecoderFactory> JavaToNativeVideoDecoderFactory(
+    JNIEnv* jni,
+    jobject decoder_factory) {
+  return rtc::MakeUnique<jni::VideoDecoderFactoryWrapper>(
+      jni, JavaParamRef<jobject>(decoder_factory));
+}
+
+std::unique_ptr<VideoEncoderFactory> JavaToNativeVideoEncoderFactory(
+    JNIEnv* jni,
+    jobject en) {
+  return rtc::MakeUnique<jni::VideoEncoderFactoryWrapper>(
+      jni, JavaParamRef<jobject>(en));
+}
+
+}  // namespace webrtc

sdk/android/native_api/codecs/wrapper.h

@@ -0,0 +1,36 @@
+/*
+ *  Copyright 2018 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.
+ */
+
+#ifndef SDK_ANDROID_NATIVE_API_CODECS_WRAPPER_H_
+#define SDK_ANDROID_NATIVE_API_CODECS_WRAPPER_H_
+
+#include <jni.h>
+#include <memory>
+
+#include "api/video_codecs/video_decoder_factory.h"
+#include "api/video_codecs/video_encoder_factory.h"
+
+namespace webrtc {
+
+// Creates an instance of webrtc::VideoDecoderFactory from Java
+// VideoDecoderFactory.
+std::unique_ptr<VideoDecoderFactory> JavaToNativeVideoDecoderFactory(
+    JNIEnv* jni,
+    jobject decoder_factory);
+
+// Creates an instance of webrtc::VideoEncoderFactory from Java
+// VideoEncoderFactory.
+std::unique_ptr<VideoEncoderFactory> JavaToNativeVideoEncoderFactory(
+    JNIEnv* jni,
+    jobject encoder_factory);
+
+}  // namespace webrtc
+
+#endif  // SDK_ANDROID_NATIVE_API_CODECS_WRAPPER_H_