Expose thumbnails of pages to iOS share extensions.

ui/base/test/ios/ui_image_test_utils.h

+// Copyright 2017 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.
+
+#ifndef UI_BASE_TEST_IOS_UI_IMAGE_TEST_UTILS_H_
+#define UI_BASE_TEST_IOS_UI_IMAGE_TEST_UTILS_H_
+
+#import <UIKit/UIKit.h>
+
+namespace ui {
+namespace test {
+namespace uiimage_utils {
+
+// Returns a new UIImage of size |size| with a solid color of |color|.
+UIImage* UIImageWithSizeAndSolidColor(CGSize const& size, UIColor* color);
+
+// Returns whether the pixels in |image1| are equal to the pixels in |image2|.
+// Both UIImages must be backed by a CGImage.
+bool UIImagesAreEqual(UIImage* image1, UIImage* image2);

[Olivier, 2017/01/25 16:10:33]

You may use |UIImage isEqual:| instead.

[jif, 2017/01/25 16:45:43]

My understanding is that isEqual compares the pointer backing the UIImage.
Those would be identical if two UIImages were loaded from the same ressource.

+
+}  // namespace uiimage_utils
+}  // test
+}  // namespace ui
+
+#endif  // UI_BASE_TEST_IOS_UI_IMAGE_TEST_UTILS_H_