Make http/tests/media/audio-seekable-contains-zero-without-ranges.html work with multibuffers.

media/blink/multibuffer_data_source_unittest.cc

 // Copyright 2013 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.
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 1360 matching lines @@
   EXPECT_CALL(host_, AddBufferedByteRange(0, kDataSize));
   ReceiveData(kDataSize);
 
   EXPECT_FALSE(data_source_->IsStreaming());
 
   FinishLoading();
   EXPECT_FALSE(loading());
   Stop();
 }
 
+TEST_F(MultibufferDataSourceTest, LengthKnownAtEOF) {
+  Initialize(kHttpUrl, true);
+  // Server responds without content-length.
+  WebURLResponse response = response_generator_->Generate200();
+  response.clearHTTPHeaderField(WebString::fromUTF8("Content-Length"));
+  response.setExpectedContentLength(kPositionNotSpecified);
+  Respond(response);
+  EXPECT_CALL(host_, AddBufferedByteRange(0, kDataSize));
+  ReceiveData(kDataSize);
+  int64_t len;
+  EXPECT_FALSE(data_source_->GetSize(&len));
+  EXPECT_TRUE(data_source_->IsStreaming());
+  EXPECT_CALL(*this, ReadCallback(kDataSize));
+  ReadAt(0);
+
+  ReadAt(kDataSize);
+  EXPECT_CALL(host_, SetTotalBytes(kDataSize));
+  EXPECT_CALL(*this, ReadCallback(0));
+  EXPECT_CALL(host_, AddBufferedByteRange(0, kDataSize * 2));
+  FinishLoading();
+
+  // Done loading, now we should know the length.
+  EXPECT_TRUE(data_source_->GetSize(&len));
+  EXPECT_EQ(kDataSize, len);
+  Stop();
+}
+
 }  // namespace media