[SyncFS] Add browser_tests to test authentication state of SyncFS

chrome/test/data/extensions/platform_apps/sync_file_system/authorization_test/test.js

Index: chrome/test/data/extensions/platform_apps/sync_file_system/authorization_test/test.js
diff --git a/chrome/test/data/extensions/platform_apps/sync_file_system/authorization_test/test.js b/chrome/test/data/extensions/platform_apps/sync_file_system/authorization_test/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..8207e0b94ca55e0f47bfdd2d8cb57c8818779916
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/sync_file_system/authorization_test/test.js
@@ -0,0 +1,47 @@
+
+chrome.test.sendMessage("Launched");
+
+function requestSyncFS() {
+  return new Promise(function(resolve, reject) {
+    chrome.syncFileSystem.requestFileSystem(function(fs) {
+      if (fs) {
+        resolve(fs);
+      } else {
+        reject(chrome.runtime.lastError);
+      }
+    });
+  });
+}
+
+function synchronizeToTestHarness(message) {
+  return function() { return new Promise(function(resolve) {
+      chrome.test.sendMessage('checkpoint: ' + message, resolve);
+    });
+  };
+}
+
+var fs = null;
+requestSyncFS()
+.then(function() {
+  chrome.test.fail('Unexpected requestSyncFS success');
+})
+.catch(synchronizeToTestHarness('Failed to get syncfs'))
+.then(requestSyncFS)
+.then(function(fs_) {
+  fs = fs_;
+  return new Promise(function(resolve, reject) {
+    fs.root.getFile('/foo', {create: true}, resolve, reject);
+  });
+})
+.then(synchronizeToTestHarness('"/foo" created'))
+.then(function() {
+  return new Promise(function(resolve, reject) {
+    fs.root.getFile('/bar', {create: true}, resolve, reject);
+  });
+})
+.then(synchronizeToTestHarness('"/bar" created'))
+.then(function() {
+  chrome.test.succeed();
+}).catch(function() {
+  chrome.test.fail();
+});