Revert of 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.
- */
-
-#include "webrtc/sdk/android/src/jni/pc/mediaconstraints_jni.h"
-
-namespace webrtc_jni {
-
-MediaConstraintsJni::MediaConstraintsJni(JNIEnv* jni, jobject j_constraints) {
-  PopulateConstraintsFromJavaPairList(jni, j_constraints, "mandatory",
-                                      &mandatory_);
-  PopulateConstraintsFromJavaPairList(jni, j_constraints, "optional",
-                                      &optional_);
-}
-
-// static
-void MediaConstraintsJni::PopulateConstraintsFromJavaPairList(
-    JNIEnv* jni,
-    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