Android: Generate JNI code for stats

This CL also unifies the functions for converting from C++ to Java, and
generates the boiler plate for converting C++ vectors to Java arrays.

Bug: webrtc:8278
Change-Id: I262e9162beae8a64ba0e8b6a27e1081207b03961
Reviewed-on: https://webrtc-review.googlesource.com/26020
Commit-Queue: Magnus Jedvert <magjed@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20918}
diff --git a/sdk/android/api/org/webrtc/IceCandidate.java b/sdk/android/api/org/webrtc/IceCandidate.java
index 51865e9..eebc9d9 100644
--- a/sdk/android/api/org/webrtc/IceCandidate.java
+++ b/sdk/android/api/org/webrtc/IceCandidate.java
@@ -49,9 +49,4 @@
   String getSdp() {
     return sdp;
   }
-
-  @CalledByNative
-  static IceCandidate[] createArray(int size) {
-    return new IceCandidate[size];
-  }
 }
diff --git a/sdk/android/api/org/webrtc/StatsObserver.java b/sdk/android/api/org/webrtc/StatsObserver.java
index b1ad0de..b9984c1 100644
--- a/sdk/android/api/org/webrtc/StatsObserver.java
+++ b/sdk/android/api/org/webrtc/StatsObserver.java
@@ -13,5 +13,5 @@
 /** Interface for observing Stats reports (see webrtc::StatsObservers). */
 public interface StatsObserver {
   /** Called when the reports are ready.*/
-  public void onComplete(StatsReport[] reports);
+  @CalledByNative public void onComplete(StatsReport[] reports);
 }
diff --git a/sdk/android/api/org/webrtc/StatsReport.java b/sdk/android/api/org/webrtc/StatsReport.java
index b5396fc..b8f1cf8 100644
--- a/sdk/android/api/org/webrtc/StatsReport.java
+++ b/sdk/android/api/org/webrtc/StatsReport.java
@@ -17,6 +17,7 @@
     public final String name;
     public final String value;
 
+    @CalledByNative("Value")
     public Value(String name, String value) {
       this.name = name;
       this.value = value;
@@ -36,6 +37,7 @@
   public final double timestamp;
   public final Value[] values;
 
+  @CalledByNative
   public StatsReport(String id, String type, double timestamp, Value[] values) {
     this.id = id;
     this.type = type;