drive: Use "/drive/root" namespace and fix Files app and tests.

chrome/test/data/extensions/api_test/file_browser/file_watcher_test/test.js

Index: chrome/test/data/extensions/api_test/file_browser/file_watcher_test/test.js
diff --git a/chrome/test/data/extensions/api_test/file_browser/file_watcher_test/test.js b/chrome/test/data/extensions/api_test/file_browser/file_watcher_test/test.js
index ddd4aa3f1dd66bb82bd283ae6317f55804f221b1..5bef176a951e4c577570376b324c973d356861ff 100644
--- a/chrome/test/data/extensions/api_test/file_browser/file_watcher_test/test.js
+++ b/chrome/test/data/extensions/api_test/file_browser/file_watcher_test/test.js
@@ -292,9 +292,9 @@ function initTests(callback) {
             testParams.isOnDrive = mountPointPath == 'drive/';
 
             var testWatchEntries = [
-              {name: 'file', path: 'test_dir/test_file.xul', type: 'file'},
-              {name: 'dir', path: 'test_dir/', type: 'dir'},
-              {name: 'subdir', path: 'test_dir/subdir', type: 'dir'},
+              {name: 'file', path: 'root/test_dir/test_file.xul', type: 'file'},
+              {name: 'dir', path: 'root/test_dir/', type: 'dir'},
+              {name: 'subdir', path: 'root/test_dir/subdir', type: 'dir'},
             ];
 
             // Gets the first entry in |testWatchEntries| list.
@@ -378,7 +378,7 @@ initTests(function(testParams, errorMessage) {
       testEventListener.start();
 
       testParams.mountPoint.getDirectory(
-          'test_dir/subdir/subsubdir', {create: true, exclusive: true},
+          'root/test_dir/subdir/subsubdir', {create: true, exclusive: true},
           testEventListener.onFileSystemOperation.bind(testEventListener),
           testEventListener.onError.bind(testEventListener,
                                          'Failed to create directory.'));
@@ -393,7 +393,7 @@ initTests(function(testParams, errorMessage) {
       testEventListener.start();
 
       testParams.mountPoint.getFile(
-          'test_dir/subdir/file', {create: true, exclusive: true},
+          'root/test_dir/subdir/file', {create: true, exclusive: true},
           testEventListener.onFileSystemOperation.bind(testEventListener),
           testEventListener.onError.bind(testEventListener,
                                          'Failed to create file.'));
@@ -409,7 +409,7 @@ initTests(function(testParams, errorMessage) {
       testEventListener.start();
 
       testParams.mountPoint.getFile(
-          'test_dir/subdir/file', {},
+          'root/test_dir/subdir/file', {},
           function(entry) {
             entry.moveTo(testParams.entries.subdir, 'renamed',
                 testEventListener.onFileSystemOperation.bind(testEventListener),
@@ -429,7 +429,7 @@ initTests(function(testParams, errorMessage) {
       testEventListener.start();
 
       testParams.mountPoint.getFile(
-          'test_dir/subdir/renamed', {},
+          'root/test_dir/subdir/renamed', {},
           function(entry) {
             entry.remove(
                 testEventListener.onFileSystemOperation.bind(testEventListener,
@@ -456,7 +456,7 @@ initTests(function(testParams, errorMessage) {
       testEventListener.start();
 
       testParams.mountPoint.getFile(
-          'test_dir/test_file.xul', {},
+          'root/test_dir/test_file.xul', {},
           function(entry) {
             entry.remove(
                 testEventListener.onFileSystemOperation.bind(testEventListener,
@@ -477,7 +477,7 @@ initTests(function(testParams, errorMessage) {
       testEventListener.start();
 
       testParams.mountPoint.getDirectory(
-          'test_dir/subdir/subsubdir', {},
+          'root/test_dir/subdir/subsubdir', {},
           function(entry) {
             entry.removeRecursively(
                 testEventListener.onFileSystemOperation.bind(testEventListener,
@@ -503,7 +503,7 @@ initTests(function(testParams, errorMessage) {
                                          'changed', 'deleted');
       testEventListener.start();
 
-      testParams.mountPoint.getDirectory('test_dir/subdir', {},
+      testParams.mountPoint.getDirectory('root/test_dir/subdir', {},
           function(entry) {
             entry.removeRecursively(
                 testEventListener.onFileSystemOperation.bind(testEventListener,