Implement declarativeContent API.

chrome/browser/extensions/api/declarative_content/content_action.h

+// Copyright (c) 2012 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_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_ACTION_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_ACTION_H_
+
+#include <string>
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/extensions/api/declarative/declarative_rule.h"
+
+class Profile;
+
+namespace base {
+class Time;
+class Value;
+}
+
+namespace content {
+class WebContents;
+}
+
+namespace extensions {
+
+// Base class for all ContentActions of the declarative content API.
+class ContentAction {
+ public:
+  // Type identifiers for concrete ContentActions.
+  enum Type {
+    ACTION_SHOW_PAGE_ACTION,
+  };
+
+  struct ApplyInfo {
+    Profile* profile;
+    content::WebContents* tab;
+  };
+
+  ContentAction();
+  virtual ~ContentAction();
+
+  virtual Type GetType() const = 0;
+
+  // Applies or reverts this ContentAction on a particular tab for a particular
+  // extension.  Revert exists to keep the actions up to date as the page
+  // changes.
+  virtual void Apply(const std::string& extension_id,
+                     const base::Time& extension_install_time,
+                     ApplyInfo* apply_info) const = 0;
+  virtual void Revert(const std::string& extension_id,
+                      const base::Time& extension_install_time,
+                      ApplyInfo* apply_info) const = 0;
+
+  // Factory method that instantiates a concrete ContentAction
+  // implementation according to |json_action|, the representation of the
+  // ContentAction as received from the extension API.
+  // Sets |error| and returns NULL in case of a semantic error that cannot
+  // be caught by schema validation. Sets |bad_message| and returns NULL
+  // in case the input is syntactically unexpected.
+  static scoped_ptr<ContentAction> Create(const base::Value& json_action,
+                                          std::string* error,
+                                          bool* bad_message);
+};
+
+typedef DeclarativeActionSet<ContentAction> ContentActionSet;
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_CONTENT_CONTENT_ACTION_H_