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

webrtc/sdk/android/src/jni/pc/mediaconstraints_jni.cc

 /*
  *  Copyright 2017 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 WEBRTC_SDK_ANDROID_SRC_JNI_VIDEO_JNI_H_
-#define WEBRTC_SDK_ANDROID_SRC_JNI_VIDEO_JNI_H_
-
-#include <jni.h>
-
-#include "webrtc/rtc_base/scoped_ref_ptr.h"
-
-namespace cricket {
-class WebRtcVideoEncoderFactory;
-class WebRtcVideoDecoderFactory;
-}  // namespace cricket
+#include "webrtc/sdk/android/src/jni/pc/mediaconstraints_jni.h"
 
 namespace webrtc_jni {
 
-class SurfaceTextureHelper;
+MediaConstraintsJni::MediaConstraintsJni(JNIEnv* jni, jobject j_constraints) {
+  PopulateConstraintsFromJavaPairList(jni, j_constraints, "mandatory",
+                                      &mandatory_);
+  PopulateConstraintsFromJavaPairList(jni, j_constraints, "optional",
+                                      &optional_);
+}
 
-cricket::WebRtcVideoEncoderFactory* CreateVideoEncoderFactory(
+// static
+void MediaConstraintsJni::PopulateConstraintsFromJavaPairList(
     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);
+    jobject j_constraints,
+    const char* field_name,
+    Constraints* field) {
+  jfieldID j_id = GetFieldID(jni, GetObjectClass(jni, j_constraints),
+                             field_name, "Ljava/util/List;");
+  jobject j_list = GetObjectField(jni, j_constraints, j_id);
+  for (jobject entry : Iterable(jni, j_list)) {
+    jmethodID get_key = GetMethodID(jni, GetObjectClass(jni, entry), "getKey",
+                                    "()Ljava/lang/String;");
+    jstring j_key =
+        reinterpret_cast<jstring>(jni->CallObjectMethod(entry, get_key));
+    CHECK_EXCEPTION(jni) << "error during CallObjectMethod";
+    jmethodID get_value = GetMethodID(jni, GetObjectClass(jni, entry),
+                                      "getValue", "()Ljava/lang/String;");
+    jstring j_value =
+        reinterpret_cast<jstring>(jni->CallObjectMethod(entry, get_value));
+    CHECK_EXCEPTION(jni) << "error during CallObjectMethod";
+    field->push_back(
+        Constraint(JavaToStdString(jni, j_key), JavaToStdString(jni, j_value)));
+  }
+}
 
 }  // namespace webrtc_jni
-
-#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_VIDEO_JNI_H_