[LazyParseCSS] Add metrics for total # of rules at 0% and 100% usage

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

 // Copyright 2014 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/parser/CSSParserImpl.h"
 
 #include "core/css/CSSCustomIdentValue.h"
 #include "core/css/CSSCustomPropertyDeclaration.h"
 #include "core/css/CSSKeyframesRule.h"
 #include "core/css/CSSStyleSheet.h"
@@ skipping 227 matching lines @@
         context, tokenizer.takeEscapedStrings(), string, parser.m_styleSheet);
   }
   bool firstRuleValid =
       parser.consumeRuleList(tokenizer.tokenRange(), TopLevelRuleList,
                              [&styleSheet](StyleRuleBase* rule) {
                                if (rule->isCharsetRule())
                                  return;
                                styleSheet->parserAppendRule(rule);
                              });
   styleSheet->setHasSyntacticallyValidCSSHeader(firstRuleValid);
+  if (parser.m_lazyState)
+    parser.m_lazyState->finishInitialParsing();
   TRACE_EVENT_END0("blink,blink_style", "CSSParserImpl::parseStyleSheet.parse");
 
   TRACE_EVENT_END2("blink,blink_style", "CSSParserImpl::parseStyleSheet",
                    "tokenCount", tokenizer.tokenCount(), "length",
                    string.length());
 }
 
 CSSSelectorList CSSParserImpl::parsePageSelector(
     CSSParserTokenRange range,
     StyleSheetContents* styleSheet) {
@@ skipping 721 matching lines @@
     else
       return nullptr;  // Parser error, invalid value in keyframe selector
     if (range.atEnd())
       return result;
     if (range.consume().type() != CommaToken)
       return nullptr;  // Parser error
   }
 }
 
 }  // namespace blink