Add browser test for CustomizationWallpaperDownloader.

chrome/browser/chromeos/login/wallpaper_manager_test_utils.h

Index: chrome/browser/chromeos/login/wallpaper_manager_test_utils.h
diff --git a/chrome/browser/chromeos/login/wallpaper_manager_test_utils.h b/chrome/browser/chromeos/login/wallpaper_manager_test_utils.h
new file mode 100644
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+++ b/chrome/browser/chromeos/login/wallpaper_manager_test_utils.h
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+// Copyright 2014 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 CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_TEST_UTILS_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_TEST_UTILS_H_
+
+#include <vector>
+
+#include "ash/ash_constants.h"
+#include "ui/gfx/image/image_skia.h"
+
+namespace base {
+class CommandLine;
+class ScopedTempDir;
+}  // namespace base
+
+namespace chromeos {
+namespace wallpaper_manager_test_utils {
+
+// Colors used for different default wallpapers by CreateCmdlineWallpapers().
+extern const SkColor kLargeDefaultWallpaperColor;
+extern const SkColor kSmallDefaultWallpaperColor;
+extern const SkColor kLargeGuestWallpaperColor;
+extern const SkColor kSmallGuestWallpaperColor;
+
+// A custom color, specifically chosen to not
+// conflict with any of the default wallpaper colors.
+extern const SkColor kCustomWallpaperColor;
+
+// Dimension used for width and height of default wallpaper images. A
+// small value is used to minimize the amount of time spent compressing
+// and writing images.
+extern const int kWallpaperSize;
+
+// Creates compressed JPEG image of solid color.
+// Result bytes are written to |output|.
+// Returns true if gfx::JPEGCodec::Encode() succeeds.
+bool CreateJPEGImage(int width,
+                     int height,
+                     SkColor color,
+                     std::vector<unsigned char>* output);
+
+// Creates a test image of given size.
+gfx::ImageSkia CreateTestImage(int width, int height, SkColor color);
+
+// Writes a JPEG image of the specified size and color to |path|. Returns
+// true on success.
+bool WriteJPEGFile(const base::FilePath& path,
+                   int width,
+                   int height,
+                   SkColor color);
+
+// Returns true if the color at the center of |image| is close to
+// |expected_color|. (The center is used so small wallpaper images can be
+// used.)
+bool ImageIsNearColor(gfx::ImageSkia image, SkColor expected_color);
+
+// Wait until all wallpaper loading is done, and WallpaperManager comes into
+// a stable state.
+void WaitAsyncWallpaperLoadFinished();
+
+// Initializes default wallpaper paths "*default_*file" and writes JPEG
+// wallpaper images to them.
+// Only needs to be called (once) by tests that want to test loading of
+// default wallpapers.
+void CreateCmdlineWallpapers(const base::ScopedTempDir& dir,
+                             scoped_ptr<base::CommandLine>* command_line);
+
+}  // namespace wallpaper_manager_test_utils
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_TEST_UTILS_H_