make use of media_use_ffmpeg in BUILD.gn
[chromium-blink-merge.git] / extensions / browser / requirements_checker.h
bloba5c16140f87db6805b3de34091163c4629d20728
1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_
6 #define CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_
8 #include <vector>
10 #include "base/callback.h"
11 #include "base/memory/ref_counted.h"
13 namespace extensions {
14 class Extension;
16 // Validates the 'requirements' extension manifest field. This is an
17 // asynchronous process that involves several threads, but the public interface
18 // of this class (including constructor and destructor) must only be used on
19 // the UI thread.
20 class RequirementsChecker {
21 public:
22 virtual ~RequirementsChecker() {}
24 using RequirementsCheckedCallback =
25 base::Callback<void(const std::vector<std::string>& /* requirements */)>;
27 // The vector passed to the callback are any localized errors describing
28 // requirement violations. If this vector is non-empty, requirements checking
29 // failed. This should only be called once. |callback| will always be invoked
30 // asynchronously on the UI thread. |callback| will only be called once, and
31 // will be reset after called.
32 virtual void Check(const scoped_refptr<const Extension>& extension,
33 const RequirementsCheckedCallback& callback) = 0;
36 } // namespace extensions
38 #endif // CHROME_BROWSER_EXTENSIONS_REQUIREMENTS_CHECKER_H_