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

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

 /*
  *  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.
  */
 
@@ skipping 16 matching lines @@
 // to the error stream.
 #define CHECK_EXCEPTION(jni)        \
   RTC_CHECK(!jni->ExceptionCheck()) \
       << (jni->ExceptionDescribe(), jni->ExceptionClear(), "")
 
 // Helper that calls ptr->Release() and aborts the process with a useful
 // message if that didn't actually delete *ptr because of extra refcounts.
 #define CHECK_RELEASE(ptr) \
   RTC_CHECK_EQ(0, (ptr)->Release()) << "Unexpected refcount."
 
+// Convenience macro defining JNI-accessible methods in the org.webrtc package.
+// Eliminates unnecessary boilerplate and line-wraps, reducing visual clutter.
+//
+// TODO(deadbeef): Rename this macro to something like
+// "JNI_FUNCTION_DECLARATION", and use variable length arguments, such that you
+// can write:
+//
+// JNI_FUNCTION_DECLARATION(void, nativeFoo, Type arg1, Type arg2) { ...
+//
+// Instead of:
+//
+// JNI_FUNCTION_DECLARATION(void, nativeFoo)(Type arg1, Type arg2) { ...
+//
+// The latter gets handled poorly by autoformatting tools.
+#define JOW(rettype, name) \
+  extern "C" JNIEXPORT rettype JNICALL Java_org_webrtc_##name
+
 namespace webrtc_jni {
 
 jint InitGlobalJniVariables(JavaVM *jvm);
 
 // Return a |JNIEnv*| usable on this thread or NULL if this thread is detached.
 JNIEnv* GetEnv();
 
 JavaVM *GetJVM();
 
 // Return a |JNIEnv*| usable on this thread.  Attaches to |g_jvm| if necessary.
@@ skipping 43 matching lines @@
 // Given a UTF-8 encoded |native| string return a new (UTF-16) jstring.
 jstring JavaStringFromStdString(JNIEnv* jni, const std::string& native);
 
 // Given a (UTF-16) jstring return a new UTF-8 native string.
 std::string JavaToStdString(JNIEnv* jni, const jstring& j_string);
 
 // Return the (singleton) Java Enum object corresponding to |index|;
 jobject JavaEnumFromIndex(JNIEnv* jni, jclass state_class,
                           const std::string& state_class_name, int index);
 
+// Return the (singleton) Java Enum object corresponding to |index|;
+// |state_class_fragment| is something like "MediaSource$State".
+jobject JavaEnumFromIndexAndClassName(JNIEnv* jni,
+                                      const std::string& state_class_fragment,
+                                      int index);
+
 // Returns the name of a Java enum.
 std::string GetJavaEnumName(JNIEnv* jni,
                             const std::string& className,
                             jobject j_enum);
 
 jobject NewGlobalRef(JNIEnv* jni, jobject o);
 
 void DeleteGlobalRef(JNIEnv* jni, jobject o);
 
 // Scope Java local references to the lifetime of this object.  Use in all C++
@@ skipping 79 matching lines @@
  private:
   JNIEnv* jni_;
   jobject iterable_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(Iterable);
 };
 
 }  // namespace webrtc_jni
 
 #endif  // WEBRTC_SDK_ANDROID_SRC_JNI_JNI_HELPERS_H_