Invert pain to comfort throughout tracing.

tracing/tracing/extras/rail/response_interaction_record.html

Index: tracing/tracing/extras/rail/response_interaction_record.html
diff --git a/tracing/tracing/extras/rail/response_interaction_record.html b/tracing/tracing/extras/rail/response_interaction_record.html
index eb29d6bfc0968141a0184b8e25a6b002531b4420..7840d5554a56b45375c60001a3530abca095831e 100644
--- a/tracing/tracing/extras/rail/response_interaction_record.html
+++ b/tracing/tracing/extras/rail/response_interaction_record.html
@@ -13,9 +13,9 @@ found in the LICENSE file.
  * @fileoverview The Response phase of RAIL.
  */
 tr.exportTo('tr.e.rail', function() {
-  // The computeNormalizedPain regions are delineated at these millisecond
+  // The computeNormalizedComfort regions are delineated at these millisecond
   // latency values.
-  var PAIN_LATENCY_REGIONS = [150, 300, 1000, 5000];
+  var COMFORT_LATENCY_REGIONS = [150, 300, 1000, 5000];
 
   function ResponseInteractionRecord(start, duration) {
     tr.e.rail.RAILInteractionRecord.call(
@@ -26,22 +26,22 @@ tr.exportTo('tr.e.rail', function() {
   ResponseInteractionRecord.prototype = {
     __proto__: tr.e.rail.RAILInteractionRecord.prototype,
 
-    get normalizedUserPain() {
-      // User pain is derived from the time between when the user thinks they
+    get normalizedUserComfort() {
+      // User comfort is derived from the time between when the user thinks they
       // begin an interation (expectedStart) and the time when the screen first
       // changes to reflect the interaction (actualEnd).  There may be a delay
       // between expectedStart and when chrome first starts processing the
       // interaction (actualStart) if the main thread is busy.  The user doesn't
       // know when actualStart is, they only know when expectedStart is. User
-      // pain, by definition, considers only what the user experiences, so
+      // comfort, by definition, considers only what the user experiences, so
       // "duration" is defined as actualEnd - expectedStart.
 
       // https://www.desmos.com/calculator/xa9setwcmf
-      return tr.e.rail.computeNormalizedPain(this.duration, {
-        minValueExponential: PAIN_LATENCY_REGIONS[0],
-        minValueLinear: PAIN_LATENCY_REGIONS[1],
-        minValueLogarithmic: PAIN_LATENCY_REGIONS[2],
-        maxValue: PAIN_LATENCY_REGIONS[3]
+      return 1 - tr.e.rail.computeNormalizedComfort(this.duration, {
+        minValueExponential: COMFORT_LATENCY_REGIONS[0],
+        minValueLinear: COMFORT_LATENCY_REGIONS[1],
+        minValueLogarithmic: COMFORT_LATENCY_REGIONS[2],
+        maxValue: COMFORT_LATENCY_REGIONS[3]
       });
     }
   };