Add UMA Histogram Manager to Cronet.

components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/HistogramManagerTest.java

Index: components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/HistogramManagerTest.java
diff --git a/components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/HistogramManagerTest.java b/components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/HistogramManagerTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..4a20c6ac11039c61739e12d183dd82e0e740463c
--- /dev/null
+++ b/components/cronet/android/test/javatests/src/org/chromium/cronet_test_apk/HistogramManagerTest.java
@@ -0,0 +1,34 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.cronet_test_apk;
+
+import android.test.suitebuilder.annotation.SmallTest;
+
+import org.chromium.base.test.util.Feature;
+import org.chromium.net.UrlRequest;
+
+/**
+ * Test HistogramManager.
+ */
+public class HistogramManagerTest extends CronetTestBase {
+    // URLs used for tests.
+    private static final String TEST_URL = "http://127.0.0.1:8000";
+
+    CronetTestActivity mActivity;
+
+    @SmallTest
+    @Feature({"Cronet"})
+    public void testHistogramManager() throws Exception {
+        mActivity = launchCronetTestApp();
+        byte delta1[] = mActivity.mHistogramManager.getHistogramDeltas();
+
+        TestUrlRequestListener listener = new TestUrlRequestListener();
+        UrlRequest urlRequest = mActivity.mUrlRequestContext.createRequest(
+                TEST_URL, listener, listener.getExecutor());
+        urlRequest.start();
+        listener.blockForDone();
+        byte delta2[] = mActivity.mHistogramManager.getHistogramDeltas();
+    }
+}