Add HttpUrlConnection backed implementation of CronetEngine.

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

Index: components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java
diff --git a/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java b/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java
index 1132c06999e22942d1b07072ae4c25937ee34016..693d8d7f1689d9edbad56acbc4ed7de684636673 100644
--- a/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java
+++ b/components/cronet/android/test/javatests/src/org/chromium/net/CronetUrlRequestContextTest.java
@@ -123,6 +123,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testConfigUserAgent() throws Exception {
         String userAgentName = "User-Agent";
         String userAgentValue = "User-Agent-Value";
@@ -143,6 +144,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     // TODO(xunjieli): Remove annotation after crbug.com/539519 is fixed.
     @SuppressWarnings("deprecation")
     public void testDataReductionProxyEnabled() throws Exception {
@@ -427,6 +429,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testNetLog() throws Exception {
         Context context = getContext();
         File directory = new File(PathUtils.getDataDirectory(context));
@@ -529,6 +532,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testNetLogWithBytes() throws Exception {
         Context context = getContext();
         File directory = new File(PathUtils.getDataDirectory(context));
@@ -599,6 +603,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testEnableHttpCacheDisabled() throws Exception {
         enableCache(CronetEngine.Builder.HTTP_CACHE_DISABLED);
         String url = NativeTestServer.getFileURL("/cacheable.txt");
@@ -631,6 +636,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testEnableHttpCacheDiskNoHttp() throws Exception {
         enableCache(CronetEngine.Builder.HTTP_CACHE_DISABLED);
         String url = NativeTestServer.getFileURL("/cacheable.txt");