DevTools: [MediaQueryInspector] Compute media query length on backend

Source/core/inspector/InspectorCSSAgent.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 23 matching lines @@
 #include "core/css/CSSComputedStyleDeclaration.h"
 #include "core/css/CSSDefaultStyleSheets.h"
 #include "core/css/CSSImportRule.h"
 #include "core/css/CSSMediaRule.h"
 #include "core/css/CSSRule.h"
 #include "core/css/CSSRuleList.h"
 #include "core/css/CSSStyleRule.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/MediaList.h"
 #include "core/css/MediaQuery.h"
+#include "core/css/MediaValues.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRule.h"
 #include "core/css/StyleSheet.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/StyleSheetList.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeList.h"
 #include "core/fetch/CSSStyleSheetResource.h"
 #include "core/fetch/ResourceClient.h"
@@ skipping 963 matching lines @@
         for (size_t j = 0; j < expressions.size(); ++j) {
             MediaQueryExp* mediaQueryExp = expressions.at(j).get();
             MediaQueryExpValue expValue = mediaQueryExp->expValue();
             if (!expValue.isValue)
                 continue;
             const char* valueName = CSSPrimitiveValue::unitTypeToString(expValue.unit);
             RefPtr<TypeBuilder::CSS::MediaQueryExpression> mediaQueryExpression = TypeBuilder::CSS::MediaQueryExpression::create()
                 .setValue(expValue.value)
                 .setUnit(String(valueName))
                 .setFeature(mediaQueryExp->mediaFeature());
+            RefPtr<MediaValues> mediaValues = MediaValues::createDynamicIfFrameExists(parentStyleSheet->ownerDocument()->frame());
+            int computedLength;
+            if (mediaValues->computeLength(expValue.value, expValue.unit, computedLength))
+                mediaQueryExpression->setComputedLength(computedLength);
+
             expressionArray->addItem(mediaQueryExpression);
             hasExpressionItems = true;
         }
         if (hasExpressionItems) {
             mediaListArray->addItem(expressionArray);
             hasMediaQueryItems = true;
         }
     }
 
     RefPtr<TypeBuilder::CSS::CSSMedia> mediaObject = TypeBuilder::CSS::CSSMedia::create()
@@ skipping 409 matching lines @@
             documentsToChange.add(element->ownerDocument());
     }
 
     m_nodeIdToForcedPseudoState.clear();
     for (HashSet<Document*>::iterator it = documentsToChange.begin(), end = documentsToChange.end(); it != end; ++it)
         (*it)->setNeedsStyleRecalc(SubtreeStyleChange);
 }
 
 } // namespace WebCore