Allow custom metrics implementations on Android.

webrtc/api/android/java/src/org/webrtc/Histogram.java

Index: webrtc/api/android/java/src/org/webrtc/Histogram.java
diff --git a/webrtc/api/android/java/src/org/webrtc/Histogram.java b/webrtc/api/android/java/src/org/webrtc/Histogram.java
new file mode 100644
index 0000000000000000000000000000000000000000..89290236f164c0f0ef52c75b9d533480b9aadec7
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+++ b/webrtc/api/android/java/src/org/webrtc/Histogram.java
@@ -0,0 +1,39 @@
+/*
+ *  Copyright 2016 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;
+
+/**
+ * Class for holding the native pointer of a histogram. Since there is no way to destroy a
+ * histogram, please don't create unnecessary instances of this object. This class is thread safe.
+ *
+ * Usage example:
+ * private static final Histogram someMetricHistogram =
+ *     Histogram.createCounts("WebRTC.Video.SomeMetric", 1, 10000, 50);
+ * someMetricHistogram.addSample(someVariable);
+ */
+class Histogram {
+  private final long handle;
+
+  private Histogram(long handle, String name) {
+    this.handle = handle;
+  }
+
+  static public Histogram createCounts(String name, int min, int max, int bucketCount) {
+    return new Histogram(nativeCreateCounts(name, min, max, bucketCount));
+  }
+
+  public void addSample(int sample) {
+    nativeAddSample(handle, sample);
+  }
+
+  private static native long nativeCreateCounts(String name, int min, int max, int bucketCount);
+  private static native void nativeAddSample(long handle, int sample);
+}