Fix bug in net::RequestPriority -> HTTP/2 dependency conversion.

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 5d4e3b3d149b1518f8fa3f0d676c823cee8f8f2d..81a8154f681294d0b857bc89248829f42742b98a 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -183,6 +183,11 @@ const char kNpnTrialName[] = "NPN";
 const char kNpnTrialEnabledGroupNamePrefix[] = "Enable";
 const char kNpnTrialDisabledGroupNamePrefix[] = "Disable";
 
+// Field trial for priority dependencies.
+const char kSpdyDependenciesFieldTrial[] = "SpdyEnableDependencies";
+const char kSpdyDependenciesFieldTrialEnable[] = "Enable";
+const char kSpdyDepencenciesFieldTrialDisable[] = "Disable";
+
 #if defined(OS_MACOSX)
 void ObserveKeychainEvents() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
@@ -807,6 +812,7 @@ void IOThread::Init() {
           switches::kEnableUserAlternateProtocolPorts)) {
     globals_->enable_user_alternate_protocol_ports = true;
   }
+  ConfigurePriorityDependencies();
   globals_->enable_brotli.set(
       base::FeatureList::IsEnabled(features::kBrotliEncoding));
   globals_->enable_token_binding =
@@ -1109,6 +1115,9 @@ void IOThread::InitializeNetworkSessionParamsFromGlobals(
 
   globals.enable_brotli.CopyToIfSet(&params->enable_brotli);
 
+  globals.enable_priority_dependencies.CopyToIfSet(
+      &params->enable_priority_dependencies);
+
   globals.enable_quic.CopyToIfSet(&params->enable_quic);
   globals.disable_quic_on_timeout_with_open_streams.CopyToIfSet(
     &params->disable_quic_on_timeout_with_open_streams);
@@ -1215,6 +1224,16 @@ void IOThread::UpdateDnsClientEnabled() {
   globals()->host_resolver->SetDnsClientEnabled(*dns_client_enabled_);
 }
 
+void IOThread::ConfigurePriorityDependencies() {
+  std::string group =
+      base::FieldTrialList::FindFullName(kSpdyDependenciesFieldTrial);
+  if (group == kSpdyDependenciesFieldTrialEnable) {
+    globals_->enable_priority_dependencies.set(true);
+  } else if (group == kSpdyDepencenciesFieldTrialDisable) {
+    globals_->enable_priority_dependencies.set(false);
+  }
+}
+
 void IOThread::ConfigureQuic(const base::CommandLine& command_line) {
   // Always fetch the field trial group to ensure it is reported correctly.
   // The command line flags will be associated with a group that is reported