Let QUIC streams write 16k before ceding. Behind FLAG_quic_batch_writes.

net/quic/quic_write_blocked_list.cc

Index: net/quic/quic_write_blocked_list.cc
diff --git a/net/quic/quic_write_blocked_list.cc b/net/quic/quic_write_blocked_list.cc
index e763d172f26a2704c4d8db033d1f28dfb7254eb2..0a7477249e7ee38f5aa9d7fc991f963b95cc6abd 100644
--- a/net/quic/quic_write_blocked_list.cc
+++ b/net/quic/quic_write_blocked_list.cc
@@ -6,13 +6,14 @@
 
 namespace net {
 
-const QuicPriority QuicWriteBlockedList::kHighestPriority =
-    static_cast<QuicPriority>(net::kHighestPriority);
-const QuicPriority QuicWriteBlockedList::kLowestPriority =
-    static_cast<QuicPriority>(net::kLowestPriority);
-
 QuicWriteBlockedList::QuicWriteBlockedList()
-    : crypto_stream_blocked_(false), headers_stream_blocked_(false) {
+    : last_priority_popped_(0),
+      crypto_stream_blocked_(false),
+      headers_stream_blocked_(false) {
+  memset(batch_write_stream_id_, 0,
+         arraysize(batch_write_stream_id_) * sizeof(QuicStreamId));
+  memset(bytes_left_for_batch_write_, 0,
+         arraysize(bytes_left_for_batch_write_) * sizeof(int32));
 }
 
 QuicWriteBlockedList::~QuicWriteBlockedList() {}