Relanding: Break peerconnection_jni.cc into multiple files, in "pc" directory.

webrtc/sdk/android/src/jni/pc/datachannelobserver_jni.h

Index: webrtc/sdk/android/src/jni/pc/datachannelobserver_jni.h
diff --git a/webrtc/sdk/android/src/jni/video_jni.h b/webrtc/sdk/android/src/jni/pc/datachannelobserver_jni.h
similarity index 30%
copy from webrtc/sdk/android/src/jni/video_jni.h
copy to webrtc/sdk/android/src/jni/pc/datachannelobserver_jni.h
index 09a193f62c8e05d293e2484b849f04afec6643e8..2b837a32fb3cbd5176e2163da3135342920c804c 100644
--- a/webrtc/sdk/android/src/jni/video_jni.h
+++ b/webrtc/sdk/android/src/jni/pc/datachannelobserver_jni.h
@@ -8,33 +8,35 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_VIDEO_JNI_H_
-#define WEBRTC_SDK_ANDROID_SRC_JNI_VIDEO_JNI_H_
+#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_PC_DATACHANNELOBSERVER_JNI_H_
+#define WEBRTC_SDK_ANDROID_SRC_JNI_PC_DATACHANNELOBSERVER_JNI_H_
 
-#include <jni.h>
-
-#include "webrtc/rtc_base/scoped_ref_ptr.h"
-
-namespace cricket {
-class WebRtcVideoEncoderFactory;
-class WebRtcVideoDecoderFactory;
-}  // namespace cricket
+#include "webrtc/api/datachannelinterface.h"
+#include "webrtc/sdk/android/src/jni/jni_helpers.h"
 
 namespace webrtc_jni {
 
-class SurfaceTextureHelper;
-
-cricket::WebRtcVideoEncoderFactory* CreateVideoEncoderFactory(
-    JNIEnv* jni,
-    jobject j_encoder_factory);
-
-cricket::WebRtcVideoDecoderFactory* CreateVideoDecoderFactory(
-    JNIEnv* jni,
-    jobject j_decoder_factory);
-
-jobject GetJavaSurfaceTextureHelper(
-    const rtc::scoped_refptr<SurfaceTextureHelper>& surface_texture_helper);
+// Adapter for a Java DataChannel$Observer presenting a C++ DataChannelObserver
+// and dispatching the callback from C++ back to Java.
+class DataChannelObserverJni : public webrtc::DataChannelObserver {
+ public:
+  DataChannelObserverJni(JNIEnv* jni, jobject j_observer);
+  virtual ~DataChannelObserverJni() {}
+
+  void OnBufferedAmountChange(uint64_t previous_amount) override;
+  void OnStateChange() override;
+  void OnMessage(const webrtc::DataBuffer& buffer) override;
+
+ private:
+  const ScopedGlobalRef<jobject> j_observer_global_;
+  const ScopedGlobalRef<jclass> j_observer_class_;
+  const ScopedGlobalRef<jclass> j_buffer_class_;
+  const jmethodID j_on_buffered_amount_change_mid_;
+  const jmethodID j_on_state_change_mid_;
+  const jmethodID j_on_message_mid_;
+  const jmethodID j_buffer_ctor_;
+};
 
 }  // namespace webrtc_jni
 
-#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_VIDEO_JNI_H_
+#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_PC_DATACHANNELOBSERVER_JNI_H_