[filebrowser] Historgram for the file browser's open time.

chrome/browser/resources/file_manager/js/main.js

Index: chrome/browser/resources/file_manager/js/main.js
diff --git a/chrome/browser/resources/file_manager/js/main.js b/chrome/browser/resources/file_manager/js/main.js
index dffad2ae6facc1ccf64916d8931fdd55069918d7..3e0f1bfb8f6e864c72dc72323b5e88d44c961add 100644
--- a/chrome/browser/resources/file_manager/js/main.js
+++ b/chrome/browser/resources/file_manager/js/main.js
@@ -16,8 +16,12 @@ function init() {
   var rootPaths = ['Downloads', 'removable', 'archive', 'tmp'];
 
   function onEntriesFound(filesystem, entries) {
+    metrics.recordTime('EnumerateRoots');
     FileManager.initStrings(function () {
+      metrics.startInterval('Construct');
       fileManager = new FileManager(document.body, filesystem, entries);
+      metrics.recordTime('Construct');
+      metrics.recordTime('TotalLoad');
       // We're ready to run.  Tests can monitor for this state with
       // ExtensionTestMessageListener listener("ready");
       // ASSERT_TRUE(listener.WaitUntilSatisfied());
@@ -26,6 +30,7 @@ function init() {
   }
 
   function onFileSystemFound(filesystem) {
+    metrics.recordTime('RequestLocalFileSystem');
     console.log('Found filesystem: ' + filesystem.name, filesystem);
 
     var entries = [];
@@ -42,6 +47,7 @@ function init() {
       }
     }
 
+    metrics.startInterval('EnumerateRoots');
     if (filesystem.name.match(/^chrome-extension_\S+:external/i)) {
       // We've been handed the local filesystem, whose root directory
       // cannot be enumerated.
@@ -54,6 +60,7 @@ function init() {
 
   util.installFileErrorToString();
 
-  console.log('Requesting filesystem.');
-  chrome.fileBrowserPrivate.requestLocalFileSystem(onFileSystemFound);
+    console.log('Requesting filesystem.');
+    metrics.startInterval('RequestLocalFileSystem');
+    chrome.fileBrowserPrivate.requestLocalFileSystem(onFileSystemFound);
 }