Add ImageOrientation class.

ui/file_manager/file_manager/foreground/js/metadata/image_orientation_unittest.js

Index: ui/file_manager/file_manager/foreground/js/metadata/image_orientation_unittest.js
diff --git a/ui/file_manager/file_manager/foreground/js/metadata/image_orientation_unittest.js b/ui/file_manager/file_manager/foreground/js/metadata/image_orientation_unittest.js
new file mode 100644
index 0000000000000000000000000000000000000000..a3d94969af51bd4ecc5cc24161e1a13f7ef2ce98
--- /dev/null
+++ b/ui/file_manager/file_manager/foreground/js/metadata/image_orientation_unittest.js
@@ -0,0 +1,43 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function testGetSizeAfterCancelling() {
+  // Crockwise 90 degrees image orientation.
+  var orientation = new ImageOrientation(0, 1, 1, 0);
+
+  // After cancelling orientation, the width and the height are swapped.
+  var size = orientation.getSizeAfterCancelling(100, 200);
+  assertEquals(200, size.width);
+  assertEquals(100, size.height);
+}
+
+function testCancelImageOrientation() {
+  // Crockwise 90 degrees image orientation.
+  var orientation = new ImageOrientation(0, 1, 1, 0);
+
+  var canvas = document.createElement('canvas');
+  canvas.width = 2;
+  canvas.height = 1;
+
+  var context = canvas.getContext('2d');
+  var imageData = context.createImageData(2, 1);
+  imageData.data[0] = 255;  // R
+  imageData.data[1] = 0;  // G
+  imageData.data[2] = 0;  // B
+  imageData.data[3] = 100;  // A
+  imageData.data[4] = 0;  // R
+  imageData.data[5] = 0;  // G
+  imageData.data[6] = 0;  // B
+  imageData.data[7] = 100;  // A
+  context.putImageData(imageData, 0, 0);
+
+  var destinationCanvas = document.createElement('canvas');
+  destinationCanvas.width = 1;
+  destinationCanvas.height = 2;
+  var destinationContext = destinationCanvas.getContext('2d');
+  orientation.cancelImageOrientation(destinationContext, 2, 1);
+  destinationContext.drawImage(canvas, 0, 0);
+  var destinationImageData = destinationContext.getImageData(0, 0, 1, 2);
+  assertArrayEquals([255, 0, 0, 100, 0, 0, 0, 100], destinationImageData.data);
+}