Creates a new CSSParserContext constructor for workers

Bug: 722511
Change-Id: I0fb1f4a027cc1c90d026583e6f3ab3ca03bb801b
Reviewed-on: https://chromium-review.googlesource.com/677405Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Fernando Serboncini <fserb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#503647}

third_party/WebKit/Source/core/css/parser/CSSParserContext.cpp

@@ -6,6 +6,7 @@
 
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/StyleSheetContents.h"
+#include "core/dom/ExecutionContext.h"
 #include "core/frame/Deprecation.h"
 #include "core/frame/Settings.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
@@ -14,6 +15,23 @@
 
 namespace blink {
 
+// static
+CSSParserContext* CSSParserContext::Create(const ExecutionContext& context) {
+  const Referrer referrer(context.Url().StrippedForUseAsReferrer(),
+                          context.GetReferrerPolicy());
+
+  ContentSecurityPolicyDisposition policy_disposition;
+  if (ContentSecurityPolicy::ShouldBypassMainWorld(&context))
+    policy_disposition = kDoNotCheckContentSecurityPolicy;
+  else
+    policy_disposition = kCheckContentSecurityPolicy;
+
+  return new CSSParserContext(
+      context.Url(), WTF::TextEncoding(), kHTMLStandardMode, kHTMLStandardMode,
+      kDynamicProfile, referrer, true, false, policy_disposition,
+      context.IsDocument() ? &ToDocument(context) : nullptr);
+}
+
 // static
 CSSParserContext* CSSParserContext::CreateWithStyleSheet(
     const CSSParserContext* other,

third_party/WebKit/Source/core/css/parser/CSSParserContext.h

@@ -55,6 +55,8 @@ class CORE_EXPORT CSSParserContext
       ReferrerPolicy referrer_policy_override,
       const WTF::TextEncoding& charset = WTF::TextEncoding(),
       SelectorProfile = kDynamicProfile);
+  // This is used for workers, where we don't have a document.
+  static CSSParserContext* Create(const ExecutionContext&);
 
   bool operator==(const CSSParserContext&) const;
   bool operator!=(const CSSParserContext& other) const {