Put Data Reduction Proxy support in Cronet behind a gyp flag

components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.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.content.Context;
 import android.content.ContextWrapper;
 import android.os.ConditionVariable;
 import android.os.Handler;
@@ skipping 98 matching lines @@
         mActivity = launchCronetTestAppAndSkipFactoryInit();
 
         // Ensure native code is loaded before trying to start test server.
         UrlRequestContext.createContext(
                 getInstrumentation().getTargetContext(),
                 new UrlRequestContextConfig().setLibraryName("cronet_tests"))
                 .shutdown();
 
         assertTrue(NativeTestServer.startNativeTestServer(
                 getInstrumentation().getTargetContext()));
-
+        if (!NativeTestServer.isDataReductionProxySupported()) {
+            return;
+        }
         String serverHostPort = NativeTestServer.getHostPort();
 
         // Enable the Data Reduction Proxy and configure it to use the test
         // server as its primary proxy, and to check successfully that this
         // proxy is OK to use.
         UrlRequestContextConfig config = new UrlRequestContextConfig();
         config.enableDataReductionProxy("test-key");
         config.setDataReductionProxyOptions(
                 serverHostPort, "unused.net:9999",
                 NativeTestServer.getFileURL("/secureproxychecksuccess.txt"));
@@ skipping 537 matching lines @@
                 new CronetUrlRequestContext(mActivity, mActivity.getContextConfig());
         CronetUrlRequestContext secondContext = new CronetUrlRequestContext(
                 mActivity.getApplicationContext(), mActivity.getContextConfig());
         CronetUrlRequestContext thirdContext = new CronetUrlRequestContext(
                 new ContextWrapper(mActivity), mActivity.getContextConfig());
         firstContext.shutdown();
         secondContext.shutdown();
         thirdContext.shutdown();
     }
 }