[WIP] Attempt to move everything cssom into a cssom namespace

third_party/WebKit/Source/core/css/cssom/CSSPerspective.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/cssom/CSSPerspective.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 
 namespace blink {
+namespace cssom {
 
 CSSPerspective* CSSPerspective::create(const CSSLengthValue* length, ExceptionState& exceptionState)
 {
     if (length->containsPercent()) {
         exceptionState.throwTypeError("CSSPerspective does not support CSSLengthValues with percent units");
         return nullptr;
     }
     return new CSSPerspective(length);
 }
 
 CSSFunctionValue* CSSPerspective::toCSSValue() const
 {
     CSSFunctionValue* result = CSSFunctionValue::create(CSSValuePerspective);
     result->append(*m_length->toCSSValue());
     return result;
 }
 
+} // namespace cssom
 } // namespace blink
+