Added the JNI interface to get and set RtpParameters and the maximum bitrate limits.

webrtc/api/java/jni/jni_helpers.h

Index: webrtc/api/java/jni/jni_helpers.h
diff --git a/webrtc/api/java/jni/jni_helpers.h b/webrtc/api/java/jni/jni_helpers.h
index 87c5ca48f22e1089bd8cf2ad39468cc17c82e8bb..481181a712a0f690716a2f4696ddf80af9742de2 100644
--- a/webrtc/api/java/jni/jni_helpers.h
+++ b/webrtc/api/java/jni/jni_helpers.h
@@ -17,6 +17,7 @@
 #include <jni.h>
 #include <string>
 
+#include "webrtc/base/constructormagic.h"
 #include "webrtc/base/checks.h"
 
 // Abort the process if |jni| has a Java exception pending.
@@ -122,6 +123,62 @@ class ScopedGlobalRef {
   T obj_;
 };
 
+// Provides a convenient way to iterate over a Java Iterable using the
+// C++ range-for loop.
+// E.g. for (jobject value : Iterable(jni, j_iterable)) { ... }
+// Note: Since Java iterators cannot be duplicated, this class is not copyable
+// to prevent creating multiple C++ iterators that refer to the same Java
+// iterator.
+class Iterator {
+ public:
+  // Creates an iterator representing the end of any collection.
+  Iterator();
+  // Creates an iterator pointing to the beginning of the specified collection.
+  Iterator(JNIEnv* jni, jobject iterable);
+
+  // Move constructor - necessary to be able to return iterator types from
+  // functions

[Taylor Brandstetter, 2016/03/22 01:16:36]

nit: period at end of comments (in cc file too)

[skvlad, 2016/03/22 02:20:00]

Done.

+  Iterator(Iterator&& other);
+
+  // Move assignment should not be used.
+  Iterator& operator=(Iterator&&) = delete;
+
+  // Advances the iterator one step
+  Iterator& operator++();
+
+  bool operator==(const Iterator& other) {
+    return (iterator_ == other.iterator_);
+  }
+  bool operator!=(const Iterator& other) { return !(*this == other); }
+
+  jobject operator*() { return value_; }
+
+ private:
+  JNIEnv* jni_ = NULL;
+  jobject iterator_ = NULL;
+  jobject value_ = NULL;
+  jmethodID has_next_id_ = NULL;
+  jmethodID next_id_ = NULL;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(Iterator);
+};
+
+class Iterable {
+ public:
+  explicit Iterable(JNIEnv* jni, jobject iterable)
+      : jni_(jni), iterable_(iterable) {}
+
+  Iterator begin() { return Iterator(jni_, iterable_); }
+
+  Iterator end() { return Iterator(); }
+
+ private:
+  JNIEnv* jni_;
+  jobject iterable_;
+
+  RTC_DISALLOW_COPY_AND_ASSIGN(Iterable);
+};
+
 }  // namespace webrtc_jni
 
 #endif  // WEBRTC_API_JAVA_JNI_JNI_HELPERS_H_