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 32c28aaf7964964a144a4bfd90e0dfda0f5938ac..304b0d6314fd508e79ba9e014dabf25fc4c5615b 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
@@ -125,6 +125,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet

[pauljensen, 2015/12/21 20:27:58]

why is this test disabled?  please add a comment

[Charles, 2015/12/21 23:36:26]

Done.

[pauljensen, 2015/12/29 16:35:53]

We really need a test that the user-agent is set properly for the Java impl.
This is quite important and has a good chance of failure and completely
untested.  Hmm.  If we re-enliven the legacyMode() plumbing as I mentioned in
another comment, we could use that to run this test on both impls.

[Charles, 2016/01/06 19:17:51]

Done.

     public void testConfigUserAgent() throws Exception {
         String userAgentName = "User-Agent";
         String userAgentValue = "User-Agent-Value";
@@ -145,6 +146,7 @@ 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 {
@@ -429,6 +431,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testNetLog() throws Exception {
         Context context = getContext();
         File directory = new File(PathUtils.getDataDirectory(context));
@@ -531,6 +534,7 @@ public class CronetUrlRequestContextTest extends CronetTestBase {
 
     @SmallTest
     @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testNetLogWithBytes() throws Exception {
         Context context = getContext();
         File directory = new File(PathUtils.getDataDirectory(context));
@@ -601,6 +605,7 @@ 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");
@@ -633,6 +638,7 @@ 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");