3 files changed, 55 insertions, 0 deletions
diff --git a/devtools/client/netmonitor/reducers/index.js b/devtools/client/netmonitor/reducers/index.js
index f36b1d91f..f003c7805 100644
--- a/devtools/client/netmonitor/reducers/index.js
+++ b/devtools/client/netmonitor/reducers/index.js
@@ -6,10 +6,12 @@
 const { combineReducers } = require("devtools/client/shared/vendor/redux");
 const filters = require("./filters");
 const requests = require("./requests");
+const timingMarkers = require("./timing-markers");
 const ui = require("./ui");
 
 module.exports = combineReducers({
   filters,
   requests,
+  timingMarkers,
   ui,
 });
diff --git a/devtools/client/netmonitor/reducers/moz.build b/devtools/client/netmonitor/reducers/moz.build
index d0ac61944..ce904cae8 100644
--- a/devtools/client/netmonitor/reducers/moz.build
+++ b/devtools/client/netmonitor/reducers/moz.build
@@ -7,5 +7,6 @@ DevToolsModules(
     'filters.js',
     'index.js',
     'requests.js',
+    'timing-markers.js',
     'ui.js',
 )
diff --git a/devtools/client/netmonitor/reducers/timing-markers.js b/devtools/client/netmonitor/reducers/timing-markers.js
new file mode 100644
index 000000000..cb500b2c4
--- /dev/null
+++ b/devtools/client/netmonitor/reducers/timing-markers.js
@@ -0,0 +1,52 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const I = require("devtools/client/shared/vendor/immutable");
+const { ADD_TIMING_MARKER,
+        CLEAR_TIMING_MARKERS } = require("../constants");
+
+const TimingMarkers = I.Record({
+  firstDocumentDOMContentLoadedTimestamp: -1,
+  firstDocumentLoadTimestamp: -1,
+});
+
+function addTimingMarker(state, action) {
+  if (action.marker.name == "document::DOMContentLoaded" &&
+      state.firstDocumentDOMContentLoadedTimestamp == -1) {
+    return state.set("firstDocumentDOMContentLoadedTimestamp",
+                     action.marker.unixTime / 1000);
+  }
+
+  if (action.marker.name == "document::Load" &&
+      state.firstDocumentLoadTimestamp == -1) {
+    return state.set("firstDocumentLoadTimestamp",
+                     action.marker.unixTime / 1000);
+  }
+
+  return state;
+}
+
+function clearTimingMarkers(state) {
+  return state.withMutations(st => {
+    st.remove("firstDocumentDOMContentLoadedTimestamp");
+    st.remove("firstDocumentLoadTimestamp");
+  });
+}
+
+function timingMarkers(state = new TimingMarkers(), action) {
+  switch (action.type) {
+    case ADD_TIMING_MARKER:
+      return addTimingMarker(state, action);
+
+    case CLEAR_TIMING_MARKERS:
+      return clearTimingMarkers(state);
+
+    default:
+      return state;
+  }
+}
+
+module.exports = timingMarkers;