Allocate a larger QUIC request body buffer

net/quic/quic_http_stream.cc

Index: net/quic/quic_http_stream.cc
diff --git a/net/quic/quic_http_stream.cc b/net/quic/quic_http_stream.cc
index e2084c0e5f04cc66b725659bcefdd51ef7b5e56e..88b40630f2b33e77de3cce7c337dc72fd7bc548b 100644
--- a/net/quic/quic_http_stream.cc
+++ b/net/quic/quic_http_stream.cc
@@ -121,12 +121,9 @@ int QuicHttpStream::SendRequest(const HttpRequestHeaders& request_headers,
     // was being called even if we didn't yet allocate raw_request_body_buf_.
     //   && (request_body_stream_->size() ||
     //       request_body_stream_->is_chunked()))
-    //
-    // Use kMaxPacketSize as the buffer size, since the request
-    // body data is written with this size at a time.
-    // TODO(rch): use a smarter value since we can't write an entire
-    // packet due to overhead.
-    raw_request_body_buf_ = new IOBufferWithSize(kMaxPacketSize);
+    // Use 10 packets as the body buffer size to give enough space to
+    // help ensure we don't often send out partial packets.
+    raw_request_body_buf_ = new IOBufferWithSize(10 * kMaxPacketSize);
     // The request body buffer is empty at first.
     request_body_buf_ = new DrainableIOBuffer(raw_request_body_buf_.get(), 0);
   }