Files.app: Add metrics of RAW file loading time.

ui/file_manager/image_loader/request.js

Index: ui/file_manager/image_loader/request.js
diff --git a/ui/file_manager/image_loader/request.js b/ui/file_manager/image_loader/request.js
index e8cd3a5e742470fd98033873bfa7e9332162b674..93f8a03dc0fffd3929a028673a2e2172df7520db 100644
--- a/ui/file_manager/image_loader/request.js
+++ b/ui/file_manager/image_loader/request.js
@@ -237,7 +237,9 @@ Request.prototype.downloadOriginal_ = function(onSuccess, onFailure) {
 
   // Load RAW images by using Piex loader instead of XHR.
   if (FileType.getTypeForName(this.request_.url).type === 'raw') {
+    var startTime = new Date();

[Ben Kwa, 2015/04/10 15:57:31]

If you don't want to mess with raw Dates there's also
analytics.Tracker#startTiming which returns a timer object that you call #send
on when you want the timing to stop.  But what you have here also works fine.

     this.piexLoader_.load(this.request_.url).then(function(data) {
+      this.recordRawLoadingTime_(this.request_.url, startTime, new Date());
       var blob = new Blob([data.thumbnail], {type: 'image/jpeg'});
       var url = URL.createObjectURL(blob);
       this.image_.src = url;
@@ -262,6 +264,50 @@ Request.prototype.downloadOriginal_ = function(onSuccess, onFailure) {
 };
 
 /**
+ * Records loading time of RAW files.
+ * @param {string} url
+ * @param {!Date} startTime
+ * @param {!Date} endTime
+ */
+Request.prototype.recordRawLoadingTime_ = function(url, startTime, endTime) {
+  var type = FileType.getTypeForName(url);
+  var metricVariable;
+  switch (type.subtype) {
+    case 'ARW':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_ARW;
+      break;
+    case 'CR2':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_CR2;
+      break;
+    case 'DNG':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_DNG;
+      break;
+    case 'NEF':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_NEF;
+      break;
+    case 'NRW':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_NRW;
+      break;
+    case 'ORF':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_ORF;
+      break;
+    case 'RAF':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_RAF;
+      break;
+    case 'RW2':
+      metricVariable = metrics.timing.Variables.RAW_LOAD_RW2;
+      break;
+    default:
+      console.error('Invalid RAW type: ' + type.subtype + '.');
+      return;
+  }
+  metrics.getTracker().sendTiming(
+      metrics.Categories.RAW_IMAGE,
+      metricVariable,
+      endTime.getTime() - startTime.getTime());
+};
+
+/**
  * Creates a XmlHttpRequest wrapper with injected OAuth2 authentication headers.
  * @constructor
  */