[Doodle] Introduce a DoodleService

components/doodle/doodle_types.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 COMPONENTS_DOODLE_DOODLE_TYPES_H_
 #define COMPONENTS_DOODLE_DOODLE_TYPES_H_
 
+#include "base/time/time.h"
 #include "url/gurl.h"
 
 namespace doodle {
 
 enum class DoodleState {
   AVAILABLE,
   NO_DOODLE,
   DOWNLOAD_ERROR,
   PARSING_ERROR,
 };
 
 enum class DoodleType {
   UNKNOWN,
   SIMPLE,
   RANDOM,
   VIDEO,
   INTERACTIVE,
   INLINE_INTERACTIVE,
   SLIDESHOW,
 };
 
 // Information about a Doodle image. If the image is invalid, the |url| will be
 // empty and invalid. By default the dimensions are 0.
 struct DoodleImage {
   DoodleImage();
   ~DoodleImage();
 
+  bool operator==(const DoodleImage& other) const;
+  bool operator!=(const DoodleImage& other) const;
+
   GURL url;
   int height;
   int width;
   bool is_animated_gif;
   bool is_cta;
 
   // Copying and assignment allowed.
 };
 
 // All information about a current doodle that can be fetched from the remote
 // end. By default, all URLs are empty and therefore invalid.
 struct DoodleConfig {
   DoodleConfig();
   DoodleConfig(const DoodleConfig& config);  // = default;
   ~DoodleConfig();
 
+  // Checks whether this config is "equivalent" to the other. This compares all
+  // fields for equality, except for |expiry_date|.
+  bool IsEquivalent(const DoodleConfig& other) const;
+
   DoodleType doodle_type;
   std::string alt_text;
   std::string interactive_html;
 
-  base::Time expiry_date;
   GURL search_url;
   GURL target_url;
   GURL fullpage_interactive_url;
 
   DoodleImage large_image;
   DoodleImage large_cta_image;
   DoodleImage transparent_large_image;
+
+  // TODO(treib,fhorschig): Don't expose this? Clients don't care about it.
+  base::Time expiry_date;
+
+  // Copying and assignment allowed.
 };
 
 }  // namespace doodle
 
 #endif  // COMPONENTS_DOODLE_DOODLE_TYPES_H_