Implement HTTP/2 settings field trial parameters.

components/network_session_configurator/network_session_configurator.cc

Index: components/network_session_configurator/network_session_configurator.cc
diff --git a/components/network_session_configurator/network_session_configurator.cc b/components/network_session_configurator/network_session_configurator.cc
index 6074c5676ed16bbd9332f2a06f1037f53a890eae..610039523154eb3e0baf5a484bad92f22923c9b2 100644
--- a/components/network_session_configurator/network_session_configurator.cc
+++ b/components/network_session_configurator/network_session_configurator.cc
@@ -5,6 +5,7 @@
 #include "components/network_session_configurator/network_session_configurator.h"
 
 #include <map>
+#include <unordered_set>
 
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_number_conversions.h"
@@ -17,6 +18,7 @@
 #include "net/http/http_stream_factory.h"
 #include "net/quic/chromium/quic_utils_chromium.h"
 #include "net/quic/core/quic_packets.h"
+#include "net/spdy/spdy_protocol.h"
 #include "net/url_request/url_fetcher.h"
 
 namespace {
@@ -53,11 +55,40 @@ void ConfigureTCPFastOpenParams(base::StringPiece tfo_trial_group,
     params->enable_tcp_fast_open_for_ssl = true;
 }
 
+net::SettingsMap GetHttp2Settings(
+    const VariationParameters& http2_trial_params) {
+  net::SettingsMap http2_settings;
+
+  const std::string settings_string =
+      GetVariationParam(http2_trial_params, "http2_settings");
+
+  base::StringPairs key_value_pairs;
+  if (!base::SplitStringIntoKeyValuePairs(settings_string, ':', ',',
+                                          &key_value_pairs)) {
+    return http2_settings;
+  }
+
+  for (auto key_value : key_value_pairs) {
+    uint32_t key;
+    if (!base::StringToUint(key_value.first, &key))
+      continue;
+    uint32_t value;
+    if (!base::StringToUint(key_value.second, &value))
+      continue;
+    http2_settings[static_cast<net::SpdySettingsIds>(key)] = value;
+  }
+
+  return http2_settings;
+}
+
 void ConfigureHttp2Params(base::StringPiece http2_trial_group,
+                          const VariationParameters& http2_trial_params,
                           net::HttpNetworkSession::Params* params) {
   if (http2_trial_group.starts_with(kHttp2FieldTrialDisablePrefix)) {
     params->enable_http2 = false;
+    return;
   }
+  params->http2_settings = GetHttp2Settings(http2_trial_params);
 }
 
 bool ShouldEnableQuic(base::StringPiece quic_trial_group,
@@ -211,16 +242,13 @@ int GetQuicPacketReaderYieldAfterDurationMilliseconds(
 
 bool ShouldQuicRaceCertVerification(
     const VariationParameters& quic_trial_params) {
-   return base::LowerCaseEqualsASCII(
-      GetVariationParam(quic_trial_params, "race_cert_verification"),
-      "true");
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "race_cert_verification"), "true");
 }
 
-bool ShouldQuicDoNotFragment(
-    const VariationParameters& quic_trial_params) {
-   return base::LowerCaseEqualsASCII(
-      GetVariationParam(quic_trial_params, "do_not_fragment"),
-      "true");
+bool ShouldQuicDoNotFragment(const VariationParameters& quic_trial_params) {
+  return base::LowerCaseEqualsASCII(
+      GetVariationParam(quic_trial_params, "do_not_fragment"), "true");
 }
 
 bool ShouldQuicDisablePreConnectIfZeroRtt(
@@ -399,7 +427,11 @@ void ParseFieldTrials(bool is_quic_force_disabled,
 
   std::string http2_trial_group =
       base::FieldTrialList::FindFullName(kHttp2FieldTrialName);
-  ConfigureHttp2Params(http2_trial_group, params);
+  VariationParameters http2_trial_params;
+  if (!variations::GetVariationParams(kHttp2FieldTrialName,
+                                      &http2_trial_params))
+    http2_trial_params.clear();
+  ConfigureHttp2Params(http2_trial_group, http2_trial_params, params);
 
   const std::string tfo_trial_group =
       base::FieldTrialList::FindFullName(kTCPFastOpenFieldTrialName);