Teach the preload scanner about the 'nonce' attribute.

third_party/WebKit/Source/core/html/parser/PreloadRequest.h

Index: third_party/WebKit/Source/core/html/parser/PreloadRequest.h
diff --git a/third_party/WebKit/Source/core/html/parser/PreloadRequest.h b/third_party/WebKit/Source/core/html/parser/PreloadRequest.h
index 9154fff2d31c5d8b9b0f90f1b10898bc017d8944..c4ac3a38dfafd53c5a0954a3a25a42a79690e07a 100644
--- a/third_party/WebKit/Source/core/html/parser/PreloadRequest.h
+++ b/third_party/WebKit/Source/core/html/parser/PreloadRequest.h
@@ -46,6 +46,10 @@ public:
     {
         return m_crossOrigin;
     }
+
+    void setNonce(const String& nonce) { m_nonce = nonce.isolatedCopy(); }
+    const String& nonce() const { return m_nonce; }
+
     Resource::Type resourceType() const { return m_resourceType; }
 
     const String& resourceURL() const { return m_resourceURL; }
@@ -97,6 +101,7 @@ private:
     String m_charset;
     Resource::Type m_resourceType;
     CrossOriginAttributeValue m_crossOrigin;
+    String m_nonce;
     double m_discoveryTime;
     FetchRequest::DeferOption m_defer;
     FetchRequest::ResourceWidth m_resourceWidth;