Replace CSSParserString with StringView.

third_party/WebKit/Source/wtf/text/StringView.h

Index: third_party/WebKit/Source/wtf/text/StringView.h
diff --git a/third_party/WebKit/Source/wtf/text/StringView.h b/third_party/WebKit/Source/wtf/text/StringView.h
index b595bc980131b5f6f751edbe1a0b01fd9d0d8d93..94b33fd33eb6140b51bf2545de84af6f69e790a2 100644
--- a/third_party/WebKit/Source/wtf/text/StringView.h
+++ b/third_party/WebKit/Source/wtf/text/StringView.h
@@ -70,6 +70,14 @@ public:
     StringView(const UChar* chars);
     StringView(const UChar* chars, unsigned length);
 
+    // From a byte pointer.
+    StringView(const void* bytes, unsigned length, bool is8Bit)
+        : m_length(length)
+        , m_is8Bit(is8Bit)
+    {
+        m_data.bytes = bytes;
+    }
+
 #if DCHECK_IS_ON()
     ~StringView();
 #endif
@@ -83,6 +91,14 @@ public:
 
     void clear();
 
+    UChar operator[](unsigned i) const
+    {
+        SECURITY_DCHECK(i < length());
+        if (is8Bit())
+            return characters8()[i];
+        return characters16()[i];
+    }
+
     const LChar* characters8() const
     {
         ASSERT(is8Bit());
@@ -95,6 +111,8 @@ public:
         return m_data.characters16;
     }
 
+    const void* bytes() const { return m_data.bytes; }
+
     String toString() const;
 
 private:
@@ -169,6 +187,8 @@ inline void StringView::set(StringImpl& impl, unsigned offset, unsigned length)
         m_data.characters16 = impl.characters16() + offset;
 }
 
+WTF_EXPORT bool equalIgnoringASCIICase(const StringView& a, const StringView& b);
+
 // TODO(esprehn): Can't make this an overload of WTF::equal since that makes
 // calls to equal() that pass literal strings ambiguous. Figure out if we can
 // replace all the callers with equalStringView and then rename it to equal().