Files.app: Add analytics code to instrument cloud import flows.

ui/file_manager/file_manager/background/js/media_import_handler.js

Index: ui/file_manager/file_manager/background/js/media_import_handler.js
diff --git a/ui/file_manager/file_manager/background/js/media_import_handler.js b/ui/file_manager/file_manager/background/js/media_import_handler.js
index bbc64371624a23f8d4e6e87aa237f1dbfe4de9ba..497210dfa6d19ec75b051753577ef2edd8f2e26e 100644
--- a/ui/file_manager/file_manager/background/js/media_import_handler.js
+++ b/ui/file_manager/file_manager/background/js/media_import_handler.js
@@ -38,10 +38,11 @@ importer.ImportRunner.prototype.importFromScanResult;
  *
  * @param {!ProgressCenter} progressCenter
  * @param {!importer.HistoryLoader} historyLoader
- * @param {!importer.DuplicateFinder} duplicateFinder
+ * @param {!importer.DuplicateFinder.Factory} duplicateFinderFactory
+ * @param {!analytics.Tracker} tracker
  */
 importer.MediaImportHandler =
-    function(progressCenter, historyLoader, duplicateFinder) {
+    function(progressCenter, historyLoader, duplicateFinderFactory, tracker) {
   /** @private {!ProgressCenter} */
   this.progressCenter_ = progressCenter;
 
@@ -51,8 +52,11 @@ importer.MediaImportHandler =
   /** @private {!importer.TaskQueue} */
   this.queue_ = new importer.TaskQueue();
 
-  /** @private {!importer.DuplicateFinder} */
-  this.duplicateFinder_ = duplicateFinder;
+  /** @private {!importer.DuplicateFinder.Factory} */
+  this.duplicateFinderFactory_ = duplicateFinderFactory;
+
+  /** @private {!analytics.Tracker} */
+  this.tracker_ = tracker;
 
   /** @private {number} */
   this.nextTaskId_ = 0;
@@ -69,8 +73,9 @@ importer.MediaImportHandler.prototype.importFromScanResult =
       this.historyLoader_,
       scanResult,
       destinationDirectory,
-      this.duplicateFinder_,
-      destination);
+      this.duplicateFinderFactory_.get(),
+      destination,
+      this.tracker_);
 
   task.addObserver(this.onTaskProgress_.bind(this, task));
 
@@ -154,6 +159,7 @@ importer.MediaImportHandler.prototype.onTaskProgress_ =
  * @param {!importer.DuplicateFinder} duplicateFinder A duplicate-finder linked
  *     to the import destination, that will be used to deduplicate imports.
  * @param {!importer.Destination} destination The logical destination.
+ * @param {!analytics.Tracker} tracker
  */
 importer.MediaImportHandler.ImportTask = function(
     taskId,
@@ -161,7 +167,8 @@ importer.MediaImportHandler.ImportTask = function(
     scanResult,
     destinationFactory,
     duplicateFinder,
-    destination) {
+    destination,
+    tracker) {
 
   importer.TaskQueue.BaseTask.call(this, taskId);
   /** @private {string} */
@@ -182,6 +189,9 @@ importer.MediaImportHandler.ImportTask = function(
   /** @private {!importer.HistoryLoader} */
   this.historyLoader_ = historyLoader;
 
+  /** @private {!analytics.Tracker} */
+  this.tracker_ = tracker;
+
   /** @private {Promise<!DirectoryEntry>} */
   this.destinationPromise_ = null;
 
@@ -199,6 +209,9 @@ importer.MediaImportHandler.ImportTask = function(
 
   /** @private {boolean} Indicates whether this task was canceled. */
   this.canceled_ = false;
+
+  /** @private {number} Number of files deduped by content dedupe. */
+  this.dedupeCount_ = 0;
 };
 
 /** @struct */
@@ -254,6 +267,7 @@ importer.MediaImportHandler.ImportTask.prototype.run = function() {
  */
 importer.MediaImportHandler.ImportTask.prototype.requestCancel = function() {
   this.canceled_ = true;
+  this.tracker_.send(importer.metrics.Events.IMPORT_CANCELLED);
   if (this.cancelCallback_) {
     // Reset the callback before calling it, as the callback might do anything
     // (including calling #requestCancel again).
@@ -265,9 +279,19 @@ importer.MediaImportHandler.ImportTask.prototype.requestCancel = function() {
 
 /** @private */
 importer.MediaImportHandler.ImportTask.prototype.initialize_ = function() {
-  this.remainingFilesCount_ = this.scanResult_.getFileEntries().length;
-  this.totalBytes_ = this.scanResult_.getTotalBytes();
+  var stats = this.scanResult_.getStatistics();
+
+  this.remainingFilesCount_ = stats.newFileCount;
+  this.totalBytes_ = stats.sizeBytes;
   this.notify(importer.TaskQueue.UpdateType.PROGRESS);
+
+  this.tracker_.send(importer.metrics.Events.IMPORT_STARTED);
+  this.tracker_.send(importer.metrics.Events.IMPORT_FILE_COUNT
+                     .value(this.remainingFilesCount_));
+  this.tracker_.send(importer.metrics.Events.IMPORT_BYTE_COUNT
+                     .value(this.totalBytes_));
+  this.tracker_.send(importer.metrics.Events.HISTORY_DEDUPE_COUNT
+                     .value(stats.duplicateFileCount));
 };
 
 /**
@@ -318,6 +342,7 @@ importer.MediaImportHandler.ImportTask.prototype.importOne_ =
             if (isDuplicate) {
               // If the given file is a duplicate, don't import it again.  Just
               // update the progress indicator.
+              this.dedupeCount_++;
               this.markAsImported_(entry);
               this.processedBytes_ += entry.size;
               this.notify(importer.TaskQueue.UpdateType.PROGRESS);
@@ -451,6 +476,21 @@ importer.MediaImportHandler.ImportTask.prototype.markAsImported_ =
 /** @private */
 importer.MediaImportHandler.ImportTask.prototype.onSuccess_ = function() {
   this.notify(importer.TaskQueue.UpdateType.SUCCESS);
+  this.tracker_.send(importer.metrics.Events.IMPORT_ENDED);
+  this.tracker_.send(importer.metrics.Events.CONTENT_DEDUPE_COUNT
+                     .value(this.dedupeCount_));
+
+  // Send aggregate deduplication timings, to avoid flooding analytics with one
+  // timing per file.
+  var deduplicatorStats = this.deduplicator_.getStatistics();
+  this.tracker_.sendTiming(
+      importer.metrics.CATEGORY,
+      importer.metrics.timing.Variables.COMPUTE_HASH,
+      deduplicatorStats.computeHashTime);
+  this.tracker_.sendTiming(
+      importer.metrics.CATEGORY,
+      importer.metrics.timing.Variables.SEARCH_BY_HASH,
+      deduplicatorStats.searchHashTime);
 };
 
 /**
@@ -459,6 +499,9 @@ importer.MediaImportHandler.ImportTask.prototype.onSuccess_ = function() {
  */
 importer.MediaImportHandler.ImportTask.prototype.onError_ = function(error) {
   this.notify(importer.TaskQueue.UpdateType.ERROR);
+  // TODO(kenobi): Impedence mismatch: this gets called per-file, which is
+  // different from onSuccess, which reports overall import success.
+  this.tracker_.send(importer.metrics.Events.IMPORT_ERROR);
 };
 
 /**