Instrument CronetUrlRequestTest#testThrowOrCancelInOnCanceled flaky test

components/cronet/android/test/javatests/src/org/chromium/net/CronetTestBase.java

 // 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.net;
 
 import android.test.AndroidTestCase;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.PathUtils;
@@ skipping 148 matching lines @@
         assertEquals(expected.getUrl(), actual.getUrl());
         // Transferred bytes and proxy server are not supported in pure java
         if (!(mCronetTestFramework.mCronetEngine instanceof JavaCronetEngine)) {
             assertEquals(expected.getReceivedBytesCount(), actual.getReceivedBytesCount());
             assertEquals(expected.getProxyServer(), actual.getProxyServer());
             // This is a place where behavior intentionally differs between native and java
             assertEquals(expected.getNegotiatedProtocol(), actual.getNegotiatedProtocol());
         }
     }
 
+    static void assertContains(String expectedSubstring, String actualString) {
+        assertNotNull(actualString);
+        if (!actualString.contains(expectedSubstring)) {
+            fail("String [" + actualString + "] doesn't contain substring [" + expectedSubstring
+                    + "]");
+        }
+    }
+
     @Target(ElementType.METHOD)
     @Retention(RetentionPolicy.RUNTIME)
     public @interface CompareDefaultWithCronet {
     }
 
     @Target(ElementType.METHOD)
     @Retention(RetentionPolicy.RUNTIME)
     public @interface OnlyRunCronetHttpURLConnection {
     }
 
     @Target(ElementType.METHOD)
     @Retention(RetentionPolicy.RUNTIME)
     public @interface OnlyRunNativeCronet {}
 }