Android: Move Histogram from api to src.

This class is already package-local.

BUG=webrtc:7172

Review-Url: https://codereview.webrtc.org/2799643003
Cr-Commit-Position: refs/heads/master@{#17546}

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

@@ -0,0 +1,44 @@
+/*
+ *  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) {
+    this.handle = handle;
+  }
+
+  static public Histogram createCounts(String name, int min, int max, int bucketCount) {
+    return new Histogram(nativeCreateCounts(name, min, max, bucketCount));
+  }
+
+  static public Histogram createEnumeration(String name, int max) {
+    return new Histogram(nativeCreateEnumeration(name, max));
+  }
+
+  public void addSample(int sample) {
+    nativeAddSample(handle, sample);
+  }
+
+  private static native long nativeCreateCounts(String name, int min, int max, int bucketCount);
+  private static native long nativeCreateEnumeration(String name, int max);
+  private static native void nativeAddSample(long handle, int sample);
+}