[Cronet] Make delaying sending request headers explicit in bidirectional stream

components/cronet/android/test/javatests/src/org/chromium/net/BidirectionalStreamTest.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.os.ConditionVariable;
 import android.test.suitebuilder.annotation.SmallTest;
 
 import org.chromium.base.test.util.DisabledTest;
@@ skipping 250 matching lines @@
         assertEquals("Test String1234567890woot!", callback.mResponseAsString);
         assertEquals("bar", callback.mResponseInfo.getAllHeaders().get("echo-foo").get(0));
         assertEquals("", callback.mResponseInfo.getAllHeaders().get("echo-empty").get(0));
         assertEquals(
                 "zebra", callback.mResponseInfo.getAllHeaders().get("echo-content-type").get(0));
     }
 
     @SmallTest
     @Feature({"Cronet"})
     @OnlyRunNativeCronet
+    public void testSimplePostWithFlushAfterOneWrite() throws Exception {
+        String url = Http2TestServer.getEchoStreamUrl();
+        TestBidirectionalStreamCallback callback = new TestBidirectionalStreamCallback();
+        callback.addWriteData("Test String".getBytes(), true);
+        BidirectionalStream stream = new BidirectionalStream
+                                             .Builder(url, callback, callback.getExecutor(),
+                                                     mTestFramework.mCronetEngine)
+                                             .disableAutoFlush(true)
+                                             .addHeader("foo", "bar")
+                                             .addHeader("empty", "")
+                                             .addHeader("Content-Type", "zebra")
+                                             .build();
+        stream.start();
+        callback.blockForDone();
+        assertTrue(stream.isDone());
+
+        assertEquals(200, callback.mResponseInfo.getHttpStatusCode());
+        assertEquals("Test String", callback.mResponseAsString);
+        assertEquals("bar", callback.mResponseInfo.getAllHeaders().get("echo-foo").get(0));
+        assertEquals("", callback.mResponseInfo.getAllHeaders().get("echo-empty").get(0));
+        assertEquals(
+                "zebra", callback.mResponseInfo.getAllHeaders().get("echo-content-type").get(0));
+    }
+
+    @SmallTest
+    @Feature({"Cronet"})
+    @OnlyRunNativeCronet
     public void testSimplePostWithFlushTwice() throws Exception {
         String url = Http2TestServer.getEchoStreamUrl();
         TestBidirectionalStreamCallback callback = new TestBidirectionalStreamCallback();
         callback.addWriteData("Test String".getBytes(), false);
         callback.addWriteData("1234567890".getBytes(), false);
         callback.addWriteData("woot!".getBytes(), true);
         callback.addWriteData("Test String".getBytes(), false);
         callback.addWriteData("1234567890".getBytes(), false);
         callback.addWriteData("woot!".getBytes(), true);
         BidirectionalStream stream = new BidirectionalStream
@@ skipping 907 matching lines @@
     private static String bufferContentsToString(ByteBuffer byteBuffer, int start, int end) {
         // Use a duplicate to avoid modifying byteBuffer.
         ByteBuffer duplicate = byteBuffer.duplicate();
         duplicate.position(start);
         duplicate.limit(end);
         byte[] contents = new byte[duplicate.remaining()];
         duplicate.get(contents);
         return new String(contents);
     }
 }