Cronet Java wrappers to fallback to HttpUrlConnection if Cronet is not available.

net/cronet/android/java/src/org/chromium/net/UsedByReflection.java

Index: net/cronet/android/java/src/org/chromium/net/UsedByReflection.java
diff --git a/net/cronet/android/java/src/org/chromium/net/UsedByReflection.java b/net/cronet/android/java/src/org/chromium/net/UsedByReflection.java
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index 0000000000000000000000000000000000000000..6ae3fbd5684356ca4b0dcb8441a85aa736a0ecc6
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+++ b/net/cronet/android/java/src/org/chromium/net/UsedByReflection.java
@@ -0,0 +1,24 @@
+// 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 java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation used for marking methods and fields that are called by reflection.
+ * Useful for keeping components that would otherwise be removed by Proguard.
+ * Use the value parameter to mention a file that calls this method.
+ *
+ * Note that adding this annotation to a method is not enough to guarantee that
+ * it is kept - either its class must be referenced elsewhere in the program, or
+ * the class must be annotated with this as well.
+ */
+@Target({
+        ElementType.METHOD, ElementType.FIELD, ElementType.TYPE,
+        ElementType.CONSTRUCTOR })
+public @interface UsedByReflection {
+    String value();
+}