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

media/blink/multibuffer_data_source_unittest.cc

Index: media/blink/multibuffer_data_source_unittest.cc
diff --git a/media/blink/multibuffer_data_source_unittest.cc b/media/blink/multibuffer_data_source_unittest.cc
index f265046163ba688773acbf7e17bc19254084233f..4778cce3e532737151199618bcf013db70c2f224 100644
--- a/media/blink/multibuffer_data_source_unittest.cc
+++ b/media/blink/multibuffer_data_source_unittest.cc
@@ -1378,4 +1378,31 @@ TEST_F(MultibufferDataSourceTest, Http_NotStreamingAfterRedirect) {
   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