Split the CSSParserContext class out of CSSParserMode into its own file.

third_party/WebKit/Source/core/css/parser/CSSLazyParsingTest.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/CSSStyleSheet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSLazyParsingState.h"
 #include "core/css/parser/CSSParser.h"
-#include "core/css/parser/CSSParserMode.h"
+#include "core/css/parser/CSSParserContext.h"
 #include "core/frame/FrameHost.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/heap/Heap.h"
 #include "platform/testing/HistogramTester.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class CSSLazyParsingTest : public testing::Test {
@@ skipping 189 matching lines @@
   // Parsing the last rule bumps both Gt90 and All buckets.
   ruleAt(styleSheet, 4)->properties();
   m_histogramTester.expectTotalCount(metricName, 7);
   m_histogramTester.expectBucketCount(metricName,
                                       CSSLazyParsingState::UsageGt90, 1);
   m_histogramTester.expectBucketCount(metricName, CSSLazyParsingState::UsageAll,
                                       1);
 }
 
 }  // namespace blink