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

ui/file_manager/file_manager/background/js/test_duplicate_finder.js

Index: ui/file_manager/file_manager/background/js/test_duplicate_finder.js
diff --git a/ui/file_manager/file_manager/background/js/test_duplicate_finder.js b/ui/file_manager/file_manager/background/js/test_duplicate_finder.js
index cd09f030f0cd71d1e85a6df2a55b107abbf872cd..ffd13b1a7d4628bdc5dfc352bf3424a42dfa337a 100644
--- a/ui/file_manager/file_manager/background/js/test_duplicate_finder.js
+++ b/ui/file_manager/file_manager/background/js/test_duplicate_finder.js
@@ -20,3 +20,25 @@ importer.TestDuplicateFinder = function() {
 importer.TestDuplicateFinder.prototype.checkDuplicate = function(entry) {
   return Promise.resolve(this.returnValue);
 };
+
+/** @override */
+importer.TestDuplicateFinder.prototype.getStatistics = function() {
+  return {
+    computeHashTime: 0,
+    searchHashTime: 0
+  };
+};
+
+/**
+ * @constructor
+ * @implements {importer.DuplicateFinder.Factory}
+ * @param {!importer.TestDuplicateFinder} testInstance
+ */
+importer.TestDuplicateFinder.Factory = function(testInstance) {
+  this.testInstance_ = testInstance;
+};
+
+/** @override */
+importer.TestDuplicateFinder.Factory.prototype.get = function() {

[mtomasz, 2015/02/12 01:51:03]

nit: Can we reset this.testInstance_ to null after returning it, as this method
should never return the same value more than once?

[Ben Kwa, 2015/02/17 23:01:29]

I changed the factory to instead just do a create each time this is called, and
log the created instances.

+  return this.testInstance_;
+};