Cronet: a framework to provide alternative Cronet implementations

components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngineBuilderImpl.java

Index: components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngineBuilderImpl.java
diff --git a/components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngineBuilderImpl.java b/components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngineBuilderImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..63844a6074f513c45d63fb103b0a3946e751fd15
--- /dev/null
+++ b/components/cronet/android/java/src/org/chromium/net/impl/JavaCronetEngineBuilderImpl.java
@@ -0,0 +1,32 @@
+// Copyright 2017 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.impl;
+
+import android.content.Context;
+
+import org.chromium.net.ExperimentalCronetEngine;
+import org.chromium.net.ICronetEngineBuilder;
+
+/**
+ * Implementation of {@link ICronetEngineBuilder} that builds Java-based Cronet engine.
+ */
+public class JavaCronetEngineBuilderImpl extends CronetEngineBuilderImpl {
+    /**
+     * Builder for Platform Cronet Engine.
+     *
+     * @param context Android {@link Context} for engine to use.
+     */
+    public JavaCronetEngineBuilderImpl(Context context) {
+        super(context);
+    }
+
+    @Override
+    public ExperimentalCronetEngine build() {
+        if (getUserAgent() == null) {
+            setUserAgent(getDefaultUserAgent());
+        }
+        return new JavaCronetEngine(getUserAgent());
+    }
+}