Add browser test to the sharing dialog feature in Files.app.

chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js

Index: chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js
diff --git a/chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js b/chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js
index 92cf5ed0ca8ed87034c0dbab5d287fe314e2124d..26a407d5b6c1d544879591cc7fece2eb2a04d612 100644
--- a/chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js
+++ b/chrome/test/data/extensions/api_test/file_manager_browsertest/test_cases.js
@@ -817,6 +817,82 @@ testcase.intermediate.copyBetweenVolumes = function(targetFile,
 };
 
 /**
+ * Test sharing dialog for a file or directory on Drive
+ * @param {string} path Path for a file or a directory to be shared.
+ */
+testcase.intermediate.share = function(path) {
+  var appId;
+  StepsRunner.run([
+    // Set up File Manager.
+    function() {
+      setupAndWaitUntilReady('/drive/root/', this.next);
+    },
+    // Select the source file.
+    function(inAppId) {
+      appId = inAppId;
+      callRemoteTestUtil(
+          'selectFile', appId, [path], this.next);
+    },
+    // Wait for the share button.
+    function(result) {
+      chrome.test.assertTrue(result);
+      callRemoteTestUtil('waitForElement',
+                         appId,
+                         ['#share-button:not([disabled])'],
+                         this.next);
+    },
+    // Invoke the share dialog.
+    function(result) {
+      callRemoteTestUtil('fakeMouseClick',
+                         appId,
+                         ['#share-button'],
+                         this.next);
+    },
+    // Wait until the share dialog's contents are shown.
+    function(result) {
+      chrome.test.assertTrue(result);
+      callRemoteTestUtil('waitForElement',
+                         appId,
+                         ['.share-dialog-webview-wrapper.loaded'],
+                         this.next);
+    },
+    function(result) {
+      callRemoteTestUtil('waitForStyles',
+                         appId,
+                         [{
+                            query: '.share-dialog-webview-wrapper.loaded',
+                            styles: {
+                              width: '350px',
+                              height: '250px'
+                            }
+                          }],
+                         this.next);
+    },
+    // Wait until the share dialog's contents are shown.
+    function(result) {
+      callRemoteTestUtil('executeScriptInWebView',
+                         appId,
+                         ['.share-dialog-webview-wrapper.loaded webview',
+                          'document.querySelector("button").click()'],
+                         this.next);
+    },
+    // Wait until the share dialog's contents are hidden.
+    function(result) {
+      callRemoteTestUtil('waitForElement',
+                         appId,
+                         ['.share-dialog-webview-wrapper.loaded',
+                          null,   // iframeQuery
+                          true],  // inverse
+                         this.next);
+    },
+    // Check for Javascript errros.
+    function() {
+      checkIfNoErrorsOccured(this.next);
+    }
+  ]);
+};
+
+/**
  * Tests copy from drive's root to local's downloads.
  */
 testcase.transferFromDriveToDownloads = function() {
@@ -905,6 +981,20 @@ testcase.transferFromOfflineToDrive = function() {
 };
 
 /**
+ * Tests sharing a file on Drive
+ */
+testcase.shareFile = function() {
+  testcase.intermediate.share('world.ogv');
+};
+
+/**
+ * Tests sharing a directory on Drive
+ */
+testcase.shareDirectory = function() {
+  testcase.intermediate.share('photos');
+};
+
+/**
  * Tests hiding the search box.
  */
 testcase.hideSearchBox = function() {