Add Java binding for new getStats implementation.

webrtc/sdk/android/api/org/webrtc/RTCStatsReport.java

Index: webrtc/sdk/android/api/org/webrtc/RTCStatsReport.java
diff --git a/webrtc/sdk/android/api/org/webrtc/RTCStatsReport.java b/webrtc/sdk/android/api/org/webrtc/RTCStatsReport.java
new file mode 100644
index 0000000000000000000000000000000000000000..1732995bbe9f790a6aeca9818d715cc446fd13d1
--- /dev/null
+++ b/webrtc/sdk/android/api/org/webrtc/RTCStatsReport.java
@@ -0,0 +1,50 @@
+/*
+ *  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.
+ */
+
+package org.webrtc;
+
+import java.util.SortedMap;
+
+/** Java version of webrtc::RTCStatsReport. */

[sakal, 2017/04/11 12:50:50]

nit: Please comment is RTCStatsReport contains multiple RTCStats entries. It is
not immediately obvious.

[Taylor Brandstetter, 2017/04/13 02:33:15]

Done.

+public class RTCStatsReport {
+  private final long timestampUs;
+  private final SortedMap<String, RTCStats> stats;
+
+  public RTCStatsReport(long timestampUs, SortedMap<String, RTCStats> stats) {
+    this.timestampUs = timestampUs;
+    this.stats = stats;
+  }
+
+  // Timestamp in nanoseconds.
+  public double timestampUs() {
+    return timestampUs;
+  }
+
+  // Map of stats object IDs to stats objects. Can be used to easily look up
+  // other stats objects, when they refer to each other by ID.
+  public SortedMap<String, RTCStats> stats() {

[sakal, 2017/04/11 12:50:50]

nit: I would prefer a Map here also.

[Taylor Brandstetter, 2017/04/13 02:33:15]

Done.

+    return stats;
+  }
+
+  public String toString() {
+    StringBuilder builder = new StringBuilder();
+    builder.append("{ timestampUs: ").append(timestampUs).append(", stats: [\n");
+    boolean first = true;
+    for (RTCStats stat : stats.values()) {

[sakal, 2017/04/11 12:50:51]

We are throwing away the key here?

[Taylor Brandstetter, 2017/04/13 02:33:15]

Each key is just "stat.id()". I'm mainly returning a map as a convenience to
look up stats by ID, but I could also just return an array of RTCStats and add a
"getStatsById" helper method. Would you prefer that?

[sakal, 2017/04/18 11:10:20]

This is fine since the id is included in the objects.

+      if (!first) {
+        builder.append(",\n");
+      }
+      builder.append(stat);
+      first = false;
+    }
+    builder.append(" ] }");
+    return builder.toString();
+  }
+}