Introduce a new API to handle native notification clicks

chrome/browser/notifications/native_notification_display_service.h

Index: chrome/browser/notifications/native_notification_display_service.h
diff --git a/chrome/browser/notifications/native_notification_display_service.h b/chrome/browser/notifications/native_notification_display_service.h
index 37989383a1d846ec7f50254d7cc3ece8e25acc9b..afa6f7c9570d35a05358b4a6f6f8ca3923848f43 100644
--- a/chrome/browser/notifications/native_notification_display_service.h
+++ b/chrome/browser/notifications/native_notification_display_service.h
@@ -5,12 +5,17 @@
 #ifndef CHROME_BROWSER_NOTIFICATIONS_NATIVE_NOTIFICATION_DISPLAY_SERVICE_H_
 #define CHROME_BROWSER_NOTIFICATIONS_NATIVE_NOTIFICATION_DISPLAY_SERVICE_H_
 
+#include <map>
+#include <memory>
 #include <set>
 #include <string>
+
 #include "base/macros.h"
+#include "chrome/browser/notifications/notification_common.h"
 #include "chrome/browser/notifications/notification_display_service.h"
 
 class Notification;
+class NotificationHandler;
 class NotificationPlatformBridge;
 class Profile;
 
@@ -24,15 +29,37 @@ class NativeNotificationDisplayService : public NotificationDisplayService {
   ~NativeNotificationDisplayService() override;
 
   // NotificationDisplayService implementation.
-  void Display(const std::string& notification_id,
+  void Display(NotificationCommon::Type notification_type,
+               const std::string& notification_id,
                const Notification& notification) override;
-  void Close(const std::string& notification_id) override;
+  void Close(NotificationCommon::Type notification_type,
+             const std::string& notification_id) override;
   bool GetDisplayed(std::set<std::string>* notifications) const override;
   bool SupportsNotificationCenter() const override;
 
+  // Used by the notification bridge to propagate back events (click, close...).
+  void ProcessNotificationOperation(NotificationCommon::Operation operation,
+                                    NotificationCommon::Type notification_type,
+                                    const std::string& origin,
+                                    const std::string& notification_id,
+                                    int action_index);
+
+  // Registers an implementation object to handle notification operations
+  // for |notification_type|.
+  void AddNotificationHandler(NotificationCommon::Type notification_type,
+                              std::unique_ptr<NotificationHandler> handler);
+
+  // Removes an implementation added via |AddNotificationHandler|.
+  void RemoveNotificationHandler(NotificationCommon::Type notification_type);
+
  private:
+  NotificationHandler* GetNotificationHandler(
+      NotificationCommon::Type notification_type);
+
   Profile* profile_;
   NotificationPlatformBridge* notification_bridge_;
+  std::map<NotificationCommon::Type, std::unique_ptr<NotificationHandler>>
+      notification_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeNotificationDisplayService);
 };