Add UMA to count the usage of sendBeacon with non-simple Content-Type

third_party/WebKit/Source/core/fetch/FetchUtils.cpp

 // Copyright 2014 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.
 
 #include "core/fetch/FetchUtils.h"
 
 #include "platform/HTTPNames.h"
 #include "platform/network/HTTPHeaderMap.h"
 #include "platform/network/HTTPParsers.h"
 #include "wtf/HashSet.h"
@@ skipping 87 matching lines @@
     // Treat inspector header as a simple header, since it is added by blink when
     // inspector is open.
 
     if (equalIgnoringCase(name, "accept")
         || equalIgnoringCase(name, "accept-language")
         || equalIgnoringCase(name, "content-language")
         || equalIgnoringCase(name, HTTPNames::X_DevTools_Emulate_Network_Conditions_Client_Id)
         || equalIgnoringCase(name, "save-data"))
         return true;
 
-    if (equalIgnoringCase(name, "content-type")) {
-        AtomicString mimeType = extractMIMETypeFromMediaType(value);
-        return equalIgnoringCase(mimeType, "application/x-www-form-urlencoded")
-            || equalIgnoringCase(mimeType, "multipart/form-data")
-            || equalIgnoringCase(mimeType, "text/plain");
-    }
+    if (equalIgnoringCase(name, "content-type"))
+        return isSimpleContentType(value);
 
     return false;
 }
 
+bool FetchUtils::isSimpleContentType(const AtomicString& mediaType)
+{
+    AtomicString mimeType = extractMIMETypeFromMediaType(mediaType);
+    return equalIgnoringCase(mimeType, "application/x-www-form-urlencoded")
+        || equalIgnoringCase(mimeType, "multipart/form-data")
+        || equalIgnoringCase(mimeType, "text/plain");
+}
+
 bool FetchUtils::isSimpleRequest(const String& method, const HTTPHeaderMap& headerMap)
 {
     if (!isSimpleMethod(method))
         return false;
 
     for (const auto& header : headerMap) {
         // Preflight is required for MIME types that can not be sent via form
         // submission.
         if (!isSimpleHeader(header.key, header.value))
             return false;
@@ skipping 77 matching lines @@
 String FetchUtils::normalizeHeaderValue(const String& value)
 {
     // https://fetch.spec.whatwg.org/#concept-header-value-normalize
     // Strip leading and trailing whitespace from header value.
     // HTTP whitespace bytes are 0x09, 0x0A, 0x0D, and 0x20.
 
     return value.stripWhiteSpace(isHTTPWhitespace);
 }
 
 } // namespace blink