Gallery: Add browser tests to apply the exposure effect for an image.

chrome/test/data/extensions/api_test/file_manager_browsertest/gallery/photo_editor.js

Index: chrome/test/data/extensions/api_test/file_manager_browsertest/gallery/photo_editor.js
diff --git a/chrome/test/data/extensions/api_test/file_manager_browsertest/gallery/photo_editor.js b/chrome/test/data/extensions/api_test/file_manager_browsertest/gallery/photo_editor.js
index 0de4a9c1be5e938546f259fe6cbda7842b16f30b..2140fa6314f570f99c8e306e1f18095cf1b6b322 100644
--- a/chrome/test/data/extensions/api_test/file_manager_browsertest/gallery/photo_editor.js
+++ b/chrome/test/data/extensions/api_test/file_manager_browsertest/gallery/photo_editor.js
@@ -5,6 +5,20 @@
 'use strict';
 
 /**
+ * Waits for the "Press Enter" message.
+ *
+ * @param {AppWindow} appWindow App window.
+ * @return {Promise} Promise to be fulfilled when the element appears.
+ */
+function waitForPressEnterMessage(appWindow) {
+  return waitForElement(appWindow, '.prompt-wrapper .prompt').
+      then(function(element) {
+        chrome.test.assertEq(
+            'Press Enter when done', element.innerText.trim());
+      });
+}
+
+/**
  * Prepares the photo editor.
  *
  * @param {string} testVolumeName Test volume name passed to the addEntries
@@ -89,14 +103,10 @@ function cropImage(testVolumeName, volumeType) {
     var appWindow = args.appWindow;
     return waitAndClickElement(appWindow, '.gallery:not([locked]) button.crop').
         then(function() {
-          var promptPromise =
-              waitForElement(appWindow, '.prompt-wrapper .prompt').
-              then(function(element) {
-                chrome.test.assertEq(
-                    'Press Enter when done', element.innerText.trim());
-              });
-          var cropOverlay = waitForElement(appWindow, '.crop-overlay');
-          return Promise.all([promptPromise, cropOverlay]);
+          return Promise.all([
+            waitForPressEnterMessage(appWindow),
+            waitForElement(appWindow, '.crop-overlay')
+          ]);
         }).
         then(function() {
           chrome.test.assertTrue(sendKeyDown(appWindow, 'body', 'Enter'));
@@ -118,6 +128,77 @@ function cropImage(testVolumeName, volumeType) {
 }
 
 /**
+ * Obtains metadata from an entry.
+ *
+ * @param {Entry} entry Entry.
+ * @return {Promise} Promise to be fulfilled with the result metadata.
+ */
+function getMetadata(entry) {
+  return new Promise(entry.getMetadata.bind(entry));
+}
+
+/**
+ * Tests to exposure an image.
+ *
+ * @param {string} testVolumeName Test volume name passed to the addEntries
+ *     function. Either 'drive' or 'local'.
+ * @param {VolumeManagerCommon.VolumeType} volumeType Volume type.
+ * @return {Promise} Promise to be fulfilled with on success.
+ */
+function exposureImage(testVolumeName, volumeType) {
+  var launchedPromise = setupPhotoEditor(testVolumeName, volumeType);
+  return launchedPromise.then(function(args) {
+    var appWindow = args.appWindow;
+    var entry = args.entries[0];
+    var buttonQuery = '.gallery:not([locked]) button.exposure';
+
+    // Click the exposure button.
+    return waitAndClickElement(appWindow, buttonQuery).then(function() {
+      // Wait until the edit controls appear.
+      return Promise.all([
+        waitForPressEnterMessage(appWindow),
+        waitForElement(appWindow, 'input.range[name="brightness"]'),
+        waitForElement(appWindow, 'input.range[name="contrast"]'),
+      ]);
+    }).then(function(results) {
+      // Update bright.
+      var brightnessRange = results[1];
+      brightnessRange.value = 20;
+      chrome.test.assertTrue(
+          brightnessRange.dispatchEvent(new Event('change')));
+
+      // Update contrast.
+      var contrastRange = results[2];
+      contrastRange.value = -20;
+      chrome.test.assertTrue(
+          contrastRange.dispatchEvent(new Event('change')));
+
+      return getMetadata(entry).then(function(firstMetadata) {
+        // Push the Enter key.
+        chrome.test.assertTrue(sendKeyDown(appWindow, 'body', 'Enter'));
+
+        // Wait until the image is updated.
+        return repeatUntil(function() {
+          return getMetadata(entry).then(function(secondMetadata) {
+            if (firstMetadata.modificationTime !=
+                secondMetadata.modificationTime) {
+              return true;
+            } else {
+              return pending(
+                  '%s is not updated. ' +
+                      'First last modified: %s, Second last modified: %s.',
+                  entry.name,
+                  firstMetadata.modificationTime.toString(),
+                  secondMetadata.modificationTime.toString());
+            }
+          });
+        });
+      });
+    });
+  });
+}
+
+/**
  * The rotateImage test for Downloads.
  * @return {Promise} Promise to be fulfilled with on success.
  */
@@ -148,3 +229,19 @@ function cropImageOnDownloads() {
 function cropImageOnDrive() {
   return cropImage('drive', VolumeManagerCommon.VolumeType.DRIVE);
 }
+
+/**
+ * The exposureImage test for Downloads.
+ * @return {Promise} Promise to be fulfilled with on success.
+ */
+function exposureImageOnDownloads() {
+  return exposureImage('local', VolumeManagerCommon.VolumeType.DOWNLOADS);
+}
+
+/**
+ * The exposureImage test for Google Drive.
+ * @return {Promise} Promise to be fulfilled with on success.
+ */
+function exposureImageOnDrive() {
+  return exposureImage('drive', VolumeManagerCommon.VolumeType.DRIVE);
+}