Extracted MockManifestPermission to its own file

extensions/common/permissions/mock_manifest_permission.h

Index: extensions/common/permissions/mock_manifest_permission.h
diff --git a/extensions/common/permissions/mock_manifest_permission.h b/extensions/common/permissions/mock_manifest_permission.h
new file mode 100644
index 0000000000000000000000000000000000000000..fd4b96c9d0f493704c21c6b0b0c6d735f7b0f10d
--- /dev/null
+++ b/extensions/common/permissions/mock_manifest_permission.h
@@ -0,0 +1,45 @@
+// 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 EXTENSIONS_COMMON_PERMISSIONS_MOCK_MANIFEST_PERMISSION_H_
+#define EXTENSIONS_COMMON_PERMISSIONS_MOCK_MANIFEST_PERMISSION_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "extensions/common/permissions/manifest_permission.h"
+
+namespace base {
+class Value;
+}
+
+namespace extensions {
+
+// Useful for mocking ManifestPermission in tests.
+class MockManifestPermission : public ManifestPermission {
+ public:
+  explicit MockManifestPermission(const std::string& name);
+
+  std::string name() const override;
+  std::string id() const override;
+
+  PermissionIDSet GetPermissions() const override;
+
+  bool FromValue(const base::Value* value) override;
+  std::unique_ptr<base::Value> ToValue() const override;
+
+  ManifestPermission* Diff(const ManifestPermission* rhs) const override;
+  ManifestPermission* Union(const ManifestPermission* rhs) const override;
+  ManifestPermission* Intersect(const ManifestPermission* rhs) const override;
+
+ private:
+  std::string name_;
+
+  DISALLOW_COPY_AND_ASSIGN(MockManifestPermission);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_COMMON_PERMISSIONS_MOCK_MANIFEST_PERMISSION_H_