Collect active stylesheets and and apply asynchronously.

third_party/WebKit/Source/core/dom/StyleEngineTest.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/dom/StyleEngine.h"
 
 #include "core/css/StyleSheetContents.h"
 #include "core/dom/Document.h"
 #include "core/dom/NodeComputedStyle.h"
 #include "core/dom/shadow/ShadowRootInit.h"
@@ skipping 321 matching lines @@
   EXPECT_EQ(makeRGB(0, 0, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 
   unsigned beforeCount = styleEngine().styleForElementCount();
 
   Element* s1 = document().getElementById("s1");
   s1->setAttribute(blink::HTMLNames::mediaAttr, "(max-width: 2000px)");
   document().view()->updateAllLifecyclePhases();
 
   unsigned afterCount = styleEngine().styleForElementCount();
-  // TODO(rune@opera.com): Should be 1u for ruleset based invalidations.
-  EXPECT_EQ(8u, afterCount - beforeCount);
+  EXPECT_EQ(1u, afterCount - beforeCount);
 
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(0, 128, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 }
 
 TEST_F(StyleEngineTest, StyleMediaAttributeNoStyleChange) {
   document().body()->setInnerHTML(
       "<style id='s1' media='(max-width: 1000px)'>#t1 { color: green }</style>"
       "<div id='t1'>Green</div><div></div>");
   document().view()->updateAllLifecyclePhases();
 
   Element* t1 = document().getElementById("t1");
   ASSERT_TRUE(t1);
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(0, 128, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 
   unsigned beforeCount = styleEngine().styleForElementCount();
 
   Element* s1 = document().getElementById("s1");
   s1->setAttribute(blink::HTMLNames::mediaAttr, "(max-width: 2000px)");
   document().view()->updateAllLifecyclePhases();
 
   unsigned afterCount = styleEngine().styleForElementCount();
-  // TODO(rune@opera.com): Should be 0 for ruleset based invalidations.
-  EXPECT_EQ(8u, afterCount - beforeCount);
+  EXPECT_EQ(0u, afterCount - beforeCount);
 
   ASSERT_TRUE(t1->computedStyle());
   EXPECT_EQ(makeRGB(0, 128, 0),
             t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
 }
 
 }  // namespace blink