Prototype implementation of MediaImportHandler.

chrome/test/data/file_manager/unit_tests/media_scanner_unittest.js

Index: chrome/test/data/file_manager/unit_tests/media_scanner_unittest.js
diff --git a/chrome/test/data/file_manager/unit_tests/media_scanner_unittest.js b/chrome/test/data/file_manager/unit_tests/media_scanner_unittest.js
index 869abde355836df71ca9959ad5e7972c078c52c6..bd6ae36ffc0bc5096f39b33430745888e28d75d3 100644
--- a/chrome/test/data/file_manager/unit_tests/media_scanner_unittest.js
+++ b/chrome/test/data/file_manager/unit_tests/media_scanner_unittest.js
@@ -14,8 +14,14 @@ var chrome;
 var timeoutCallbacks;
 
 
+/**
+ * @type {!MediaScanner}
+ */
+var scanner;
+
 // Set up the test components.
 function setUp() {
+  scanner = new MediaScanner();
 }
 
 /**
@@ -78,8 +84,7 @@ function populateDir(filenames, dir) {
  * Verifies that scanning an empty filesystem produces an empty list.
  */
 function testEmptyList(errorIf) {
-  var scanner = new MediaScanner([]);
-  scanner.getFiles().then(function(files) {
+  scanner.scan([]).then(function(files) {
     errorIf(files.length !== 0);

[hirono, 2014/12/04 04:44:23]

Please use assert and reportPromise.

[Ben Kwa, 2014/12/04 07:48:08]

Okay, but can I make that change in a separate CL, since it's orthogonal to what
I'm doing here?

[Ben Kwa, 2014/12/04 19:53:01]

Acknowledged.  Will fix in a follow-up CL.

   });
 }
@@ -109,8 +114,7 @@ function testSingleLevel(errorIf) {
            * @param {!DirectoryEntry} root
            */
           function(root) {
-            var scanner = new MediaScanner([root]);
-            return scanner.getFiles();
+            return scanner.scan([root]);
           })
       .then(
           /**
@@ -168,8 +172,7 @@ function testMultiLevel(errorIf) {
            * @param {!DirectoryEntry} root
            */
           function(root) {
-            var scanner = new MediaScanner([root]);
-            return scanner.getFiles();
+            return scanner.scan([root]);
           })
       .then(
           /**
@@ -234,8 +237,7 @@ function testMultipleDirectories(errorIf) {
             return Promise.all(['foo.0', 'foo.1'].map(
                 getDirectory.bind(null, root))).then(
                     function(directories) {
-                      var scanner = new MediaScanner(directories);
-                      return scanner.getFiles();
+                      return scanner.scan(directories);
                     });
           })
       .then(