Don't set QUIC's write alarm if we are connection flow control blocked.

net/quic/quic_write_blocked_list.h

Index: net/quic/quic_write_blocked_list.h
diff --git a/net/quic/quic_write_blocked_list.h b/net/quic/quic_write_blocked_list.h
index cddd58fb37b4638b1528d16234b8c7b1d57670d8..6727fb4e826e2fae1d5653a153ab3cbcacd1347b 100644
--- a/net/quic/quic_write_blocked_list.h
+++ b/net/quic/quic_write_blocked_list.h
@@ -27,10 +27,12 @@ class NET_EXPORT_PRIVATE QuicWriteBlockedList {
   QuicWriteBlockedList();
   ~QuicWriteBlockedList();
 
-  bool HasWriteBlockedStreams() const {
-    return crypto_stream_blocked_ ||
-        headers_stream_blocked_ ||
-        base_write_blocked_list_.HasWriteBlockedStreams();
+  bool HasWriteBlockedDataStreams() const {
+    return base_write_blocked_list_.HasWriteBlockedStreams();
+  }
+
+  bool HasWriteBlockedCryptoOrHeadersStream() const {
+    return crypto_stream_blocked_ || headers_stream_blocked_;
   }
 
   size_t NumBlockedStreams() const {
@@ -89,6 +91,9 @@ class NET_EXPORT_PRIVATE QuicWriteBlockedList {
     return;
   }
 
+  bool crypto_stream_blocked() const { return crypto_stream_blocked_; }
+  bool headers_stream_blocked() const { return headers_stream_blocked_; }
+
  private:
   QuicWriteBlockedListBase base_write_blocked_list_;
   bool crypto_stream_blocked_;