media: Support transporting 0-byte DecoderBuffer over mojo

media/mojo/common/mojo_decoder_buffer_converter_unittest.cc

 // 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.
 
 #include "media/mojo/common/mojo_decoder_buffer_converter.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 78 matching lines @@
 }
 
 TEST(MojoDecoderBufferConverterTest, ConvertDecoderBuffer_EOS) {
   base::MessageLoop message_loop;
   scoped_refptr<DecoderBuffer> buffer(DecoderBuffer::CreateEOSBuffer());
 
   MojoDecoderBufferConverter converter;
   converter.ConvertAndVerify(buffer);
 }
 
+// TODO(xhwang): Investigate whether we can get rid of zero-byte-buffer.
+// See http://crbug.com/663438
+TEST(MojoDecoderBufferConverterTest, ConvertDecoderBuffer_ZeroByteBuffer) {
+  base::MessageLoop message_loop;
+  scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(0));
+
+  MojoDecoderBufferConverter converter;
+  converter.ConvertAndVerify(buffer);
+}
+
 TEST(MojoDecoderBufferConverterTest, ConvertDecoderBuffer_KeyFrame) {
   base::MessageLoop message_loop;
   const uint8_t kData[] = "hello, world";
   const size_t kDataSize = arraysize(kData);
 
   scoped_refptr<DecoderBuffer> buffer(DecoderBuffer::CopyFrom(
       reinterpret_cast<const uint8_t*>(&kData), kDataSize));
   buffer->set_is_key_frame(true);
   EXPECT_TRUE(buffer->is_key_frame());
 
@@ skipping 85 matching lines @@
       std::move(mojo_buffer),
       base::BindOnce(&MockReadCB::Run, base::Unretained(&mock_cb)));
 
   // Before the entire data is transmitted, close the handle on writer side.
   // The reader side will get notified and report the error.
   converter.writer.reset();
   run_loop.Run();
 }
 
 }  // namespace media