Add UMA for measuring Content-Dispostion header use and abuse.

net/http/http_content_disposition.h

Index: net/http/http_content_disposition.h
diff --git a/net/http/http_content_disposition.h b/net/http/http_content_disposition.h
index f3573a9dceadcc27a6c9c54e8b7c0452b4f3e2a4..580f9046e82de212461a8b990e6c6187a30646d0 100644
--- a/net/http/http_content_disposition.h
+++ b/net/http/http_content_disposition.h
@@ -19,6 +19,37 @@ class NET_EXPORT HttpContentDisposition {
     ATTACHMENT,
   };
 
+  // Properties of the Content-Disposition header. Used for UMA.
+  struct ParseResult {
+    ParseResult();
+
+    // A valid disposition-type was present.
+    bool has_disposition_type;
+
+    // The disposition-type was not 'inline' or 'attachment'.
+    bool has_unknown_disposition_type;
+
+    // Has a valid non-empty 'name' attribute.
+    bool has_name;
+
+    // Has a valid non-empty 'filename' attribute.
+    bool has_filename;
+
+    // Has a valid non-empty 'filename*' attribute.
+    bool has_ext_filename;
+
+    // The following fields are properties of the 'filename' attribute:
+
+    // quoted-string contained non-ASCII characters.
+    bool has_non_ascii_strings;
+
+    // quoted-string contained percent-encoding.
+    bool has_percent_encoded_strings;
+
+    // quoted-string contained RFC 2047 encoded words.
+    bool has_rfc2047_encoded_strings;
+  };
+
   HttpContentDisposition(const std::string& header,
                          const std::string& referrer_charset);
   ~HttpContentDisposition();
@@ -28,6 +59,8 @@ class NET_EXPORT HttpContentDisposition {
   Type type() const { return type_; }
   const std::string& filename() const { return filename_; }
 
+  const ParseResult& parse_result() const { return parse_result_; }
+
  private:
   void Parse(const std::string& header, const std::string& referrer_charset);
   std::string::const_iterator ConsumeDispositionType(
@@ -35,6 +68,7 @@ class NET_EXPORT HttpContentDisposition {
 
   Type type_;
   std::string filename_;
+  ParseResult parse_result_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpContentDisposition);
 };