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gaia/tests/atoms/reflow.js

@@ -0,0 +1,37 @@
+'use strict';
+
+(function(exports) {
+  if ('MozReflowAtom' in exports) {
+    return;
+  }
+
+  exports.MozReflowAtom = {
+    count: null,
+    _trackingManifest: null,
+
+    init: function rw_init() {
+      exports.addEventListener('developer-hud-update', this);
+    },
+
+    handleEvent: function rw_handleEvent(evt) {
+      var metric = evt.detail.metric.name || evt.detail.metric;
+      if (metric !== 'reflows' ||
+          evt.detail.manifest !== this._trackingManifest) {
+        return;
+      }
+      this.count++;
+    },
+
+    startTracking: function(manifestURL) {
+      this._trackingManifest = manifestURL;
+      this.count = 0;
+    },
+
+    stopTracking: function() {
+      this.count = 0;
+      this._trackingManifest = null;
+    },
+  };
+
+  exports.MozReflowAtom.init();
+})(window);