Measure URL resolution with raw newlines and braces.

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 53800840da18868108784a81b1d4ec79cd4c6686..0ce8353bcba98c83637d02e84e56ad6a5b474a45 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -4945,6 +4945,19 @@ void Document::setEncodingData(const DocumentEncodingData& newData) {
 }
 
 KURL Document::completeURL(const String& url) const {
+  String trimmed = url.stripWhiteSpace();
+  bool newline = trimmed.contains('\n') || trimmed.contains('\r');
+  bool brace = trimmed.contains('<');
+  if (newline)
+    UseCounter::count(*this, UseCounter::DocumentCompleteURLContainingNewline);
+  if (brace) {
+    UseCounter::count(*this,
+                      UseCounter::DocumentCompleteURLContainingOpenBrace);
+  }
+  if (newline && brace) {
+    UseCounter::count(
+        *this, UseCounter::DocumentCompleteURLContainingNewlineAndOpenBrace);
+  }
   return completeURLWithOverride(url, m_baseURL);
 }