Initial implementation of CronetBidirectionalStream.

components/cronet/android/api/src/org/chromium/net/BidirectionalStream.java

 // Copyright 2015 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.support.annotation.IntDef;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ skipping 70 matching lines @@
         }
 
         /**
          * Sets the HTTP method for the request. Returns builder to facilitate chaining.
          *
          * @param method the method to use for request. Default is 'POST'
          * @return the builder to facilitate chaining
          */
         public Builder setHttpMethod(String method) {
             if (method == null) {
-                throw new NullPointerException("Invalid method name.");
+                throw new NullPointerException("Method is required.");
             }
             mHttpMethod = method;
             return this;
         }
 
         /**
          * Adds a request header. Returns builder to facilitate chaining.
          *
          * @param header the header name
          * @param value the header value
@@ skipping 297 matching lines @@
     /**
      * Returns {@code true} if the stream was successfully started and is now
      * done (succeeded, canceled, or failed).
      *
      * @return {@code true} if the stream was successfully started and is now
      *         done (completed, canceled, or failed), otherwise returns {@code false}
      *         to indicate stream is not yet started or is in progress.
      */
     public abstract boolean isDone();
 }