Introduce WebRequestResourceType.

extensions/browser/api/web_request/web_request_resource_type.h

Index: extensions/browser/api/web_request/web_request_resource_type.h
diff --git a/extensions/browser/api/web_request/web_request_resource_type.h b/extensions/browser/api/web_request/web_request_resource_type.h
new file mode 100644
index 0000000000000000000000000000000000000000..74f4f2c9d8fa0d2154d29b2ca4eb35d74a8d6532
--- /dev/null
+++ b/extensions/browser/api/web_request/web_request_resource_type.h
@@ -0,0 +1,53 @@
+// 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_BROWSER_API_WEB_REQUEST_WEB_REQUEST_RESOURCE_TYPE_H_
+#define EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_RESOURCE_TYPE_H_
+
+#include <stdint.h>
+
+#include "base/strings/string_piece.h"
+#include "content/public/common/resource_type.h"
+
+namespace net {
+class URLRequest;
+}  // namespace net
+
+namespace extensions {
+
+// Enumerates all resource/request types that WebRequest API cares about.
+enum class WebRequestResourceType : uint8_t {
+  MAIN_FRAME,
+  SUB_FRAME,
+  STYLESHEET,
+  SCRIPT,
+  IMAGE,
+  FONT,
+  OBJECT,
+  XHR,
+  PING,
+  MEDIA,
+  WEB_SOCKET,
+
+  OTHER,      // A valid resource/request type, but none of the above.
+  UNDEFINED,  // The type is invalid or unknown.
+};
+
+// Multiple content::ResourceTypes may map to the same WebRequestResourceType,
+// but the converse is not possible.
+WebRequestResourceType ToWebRequestResourceType(content::ResourceType type);
+
+// Returns a type for a non-empty URLRequest.
+WebRequestResourceType GetWebRequestResourceType(const net::URLRequest*);
+
+// Returns a string representation of |type|, which shouldn't be UNDEFINED.
+const char* WebRequestResourceTypeToString(WebRequestResourceType type);
+
+// Returns a type such that its string representation equals to |text|. If such
+// a type doesn't exist, returns UNDEFINED.
+WebRequestResourceType ParseWebRequestResourceType(base::StringPiece text);
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_API_WEB_REQUEST_WEB_REQUEST_RESOURCE_TYPE_H_