Optimize whitespace skipping in the CSSParser.

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

Index: third_party/WebKit/Source/core/css/parser/CSSTokenizerInputStream.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSTokenizerInputStream.cpp b/third_party/WebKit/Source/core/css/parser/CSSTokenizerInputStream.cpp
index dc8bf3b7edfb51df27b50deb97170be2edcd627d..e95cbd74aff3ea6b0cc7942ba724bf5c3450f017 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSTokenizerInputStream.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSTokenizerInputStream.cpp
@@ -4,6 +4,7 @@
 
 #include "core/css/parser/CSSTokenizerInputStream.h"
 
+#include "core/html/parser/HTMLParserIdioms.h"
 #include "core/html/parser/InputStreamPreprocessor.h"
 #include "wtf/text/StringToNumber.h"
 
@@ -30,6 +31,20 @@ void CSSTokenizerInputStream::pushBack(UChar cc)
     ASSERT(nextInputChar() == cc);
 }
 
+void CSSTokenizerInputStream::advanceUntilNonWhitespace()
+{
+    // Using HTML space here rather than CSS space since we don't do preprocessing
+    if (m_string->is8Bit()) {
+        const LChar* characters = m_string->characters8();
+        while (m_offset < m_stringLength && isHTMLSpace(characters[m_offset]))
+            ++m_offset;
+    } else {
+        const UChar* characters = m_string->characters16();
+        while (m_offset < m_stringLength && isHTMLSpace(characters[m_offset]))
+            ++m_offset;
+    }
+}
+
 double CSSTokenizerInputStream::getDouble(unsigned start, unsigned end)
 {
     ASSERT(start <= end && ((m_offset + end) <= m_stringLength));