Refuse to pipeline frames, prefetches, and downloads.

net/http/http_stream_factory_impl_job.cc

Index: net/http/http_stream_factory_impl_job.cc
diff --git a/net/http/http_stream_factory_impl_job.cc b/net/http/http_stream_factory_impl_job.cc
index 408c75e718070fbcaf72ae9c5a4176c69703c39d..28532ddc038ea2c9f12901295a172258009c6e49 100644
--- a/net/http/http_stream_factory_impl_job.cc
+++ b/net/http/http_stream_factory_impl_job.cc
@@ -902,7 +902,6 @@ int HttpStreamFactoryImpl::Job::DoCreateStream() {
   if (!using_spdy_) {
     bool using_proxy = (proxy_info_.is_http() || proxy_info_.is_https()) &&
         request_info_.url.SchemeIs("http");
-    // TODO(simonjam): Support proxies.
     if (stream_factory_->http_pipelined_host_pool_.
             IsExistingPipelineAvailableForKey(*http_pipelining_key_.get())) {
       stream_.reset(stream_factory_->http_pipelined_host_pool_.
@@ -910,6 +909,7 @@ int HttpStreamFactoryImpl::Job::DoCreateStream() {
                         *http_pipelining_key_.get()));
       CHECK(stream_.get());
     } else if (!using_proxy && IsRequestEligibleForPipelining()) {
+      // TODO(simonjam): Support proxies.
       stream_.reset(
           stream_factory_->http_pipelined_host_pool_.CreateStreamOnNewPipeline(
               *http_pipelining_key_.get(),
@@ -1246,6 +1246,12 @@ bool HttpStreamFactoryImpl::Job::IsRequestEligibleForPipelining() {
   if (request_info_.method != "GET" && request_info_.method != "HEAD") {
     return false;
   }
+  if (request_info_.load_flags &
+      (net::LOAD_MAIN_FRAME | net::LOAD_SUB_FRAME | net::LOAD_PREFETCH |
+       net::LOAD_IS_DOWNLOAD)) {
+    // Avoid pipelining resources that may be streamed for a long time.
+    return false;
+  }
   return stream_factory_->http_pipelined_host_pool_.IsKeyEligibleForPipelining(
       *http_pipelining_key_.get());
 }