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

chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h

Index: chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
diff --git a/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h b/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
index ca420aa0025107faf36dc1d6aa091ad92b8d36fe..cec4b55fd37053c085ffa867d4196e5b9fdc9015 100644
--- a/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
+++ b/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
@@ -31,7 +31,8 @@ namespace extensions {
 class WebRequestConditionAttribute {
  public:
   enum Type {
-    CONDITION_RESOURCE_TYPE
+    CONDITION_RESOURCE_TYPE,
+    CONDITION_CONTENT_TYPE
   };
 
   WebRequestConditionAttribute();
@@ -100,6 +101,36 @@ class WebRequestConditionAttributeResourceType
   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_