Make static KURLs thread safe

third_party/WebKit/Source/platform/weborigin/KURL.cpp

 /*
  * Copyright (C) 2004, 2007, 2008, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2008, 2009, 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 26 matching lines @@
 #include "wtf/text/StringStatics.h"
 #include "wtf/text/StringUTF8Adaptor.h"
 #include "wtf/text/TextEncoding.h"
 #include <algorithm>
 #ifndef NDEBUG
 #include <stdio.h>
 #endif
 
 namespace blink {
 
+const char kAboutBlankUrl[] = "about:blank";
+
 static const int maximumValidPortNumber = 0xFFFE;
 static const int invalidPortNumber = 0xFFFF;
 
 #if DCHECK_IS_ON()
 static void assertProtocolIsGood(const StringView protocol) {
   DCHECK(protocol != "");
   for (size_t i = 0; i < protocol.length(); ++i) {
     LChar c = protocol.characters8()[i];
     DCHECK(c > ' ' && c < 0x7F && !(c >= 'A' && c <= 'Z'));
   }
@@ skipping 108 matching lines @@
   // read the contents of the clipboard on a drag, even without a drop.
   // Likewise with using the FrameLoader::shouldTreatURLAsLocal() function.
   return protocolIs("file");
 }
 
 bool protocolIsJavaScript(const String& url) {
   return protocolIs(url, "javascript");
 }
 
 const KURL& blankURL() {
-  DEFINE_STATIC_LOCAL(KURL, staticBlankURL, (ParsedURLString, "about:blank"));
+  DEFINE_STATIC_LOCAL(KURL, staticBlankURL, (ParsedURLString, kAboutBlankUrl));
+  DCHECK(isMainThread());
   return staticBlankURL;
 }
 
 bool KURL::isAboutBlankURL() const {
-  return *this == blankURL();
-}
-
-const KURL& srcdocURL() {
-  DEFINE_STATIC_LOCAL(KURL, staticSrcdocURL, (ParsedURLString, "about:srcdoc"));
-  return staticSrcdocURL;
+  return getString() == kAboutBlankUrl;
 }
 
 bool KURL::isAboutSrcdocURL() const {
-  return *this == srcdocURL();
+  return getString() == "about:srcdoc";
 }
 
 String KURL::elidedString() const {
   if (getString().length() <= 1024)
     return getString();
 
   return getString().left(511) + "..." + getString().right(510);
 }
 
 KURL::KURL() : m_isValid(false), m_protocolIsInHTTPFamily(false) {}
@@ skipping 673 matching lines @@
   m_string = AtomicString::fromUTF8(output.data(), output.length());
   initProtocolMetadata();
 }
 
 bool KURL::isSafeToSendToAnotherThread() const {
   return m_string.isSafeToSendToAnotherThread() &&
          (!m_innerURL || m_innerURL->isSafeToSendToAnotherThread());
 }
 
 }  // namespace blink