Add condition attribute for MIME media types from Content-Type header.

chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.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_WEBREQUEST_WEBREQUEST_CONDITION_ATTRIBUTE_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_ATTRIBUTE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 13 matching lines @@
 class URLRequest;
 }
 
 namespace extensions {
 
 // Base class for all condition attributes of the declarative Web Request API
 // except for condition attribute to test URLPatterns.
 class WebRequestConditionAttribute {
  public:
   enum Type {
-    CONDITION_RESOURCE_TYPE
+    CONDITION_RESOURCE_TYPE,
+    CONDITION_CONTENT_TYPE
   };
 
   WebRequestConditionAttribute();
   virtual ~WebRequestConditionAttribute();
 
   // Factory method that creates a WebRequestConditionAttribute for the JSON
   // dictionary {|name|: |value|} passed by the extension API. Sets |error| and
   // returns NULL if something fails.
   // The ownership of |value| remains at the caller.
   static scoped_ptr<WebRequestConditionAttribute> Create(
@@ skipping 48 matching lines @@
 
  private:
   explicit WebRequestConditionAttributeResourceType(
       const std::vector<ResourceType::Type>& types);
 
   std::vector<ResourceType::Type> types_;
 
   DISALLOW_COPY_AND_ASSIGN(WebRequestConditionAttributeResourceType);
 };
 
+// Condition that checks whether a response's Content-Type header has a
+// certain MIME media type.
+class WebRequestConditionAttributeContentType
+    : public WebRequestConditionAttribute {
+ public:
+  virtual ~WebRequestConditionAttributeContentType();
+
+  static bool IsMatchingType(const std::string& instance_type);
+
+  // Factory method, see WebRequestConditionAttribute::Create.
+  static scoped_ptr<WebRequestConditionAttribute> Create(
+      const std::string& name,
+      const base::Value* value,
+      std::string* error);
+
+  // Implementation of WebRequestConditionAttribute:
+  virtual int GetStages() const OVERRIDE;
+  virtual bool IsFulfilled(const WebRequestRule::RequestData& request_data)
+      OVERRIDE;
+  virtual Type GetType() const OVERRIDE;
+
+ private:
+  explicit WebRequestConditionAttributeContentType(
+      const std::vector<std::string>& content_types);
+
+  std::vector<std::string> content_types_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRequestConditionAttributeContentType);
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_ATTRIBUTE_H_