Make sure media query results are re-collected.

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 302 matching lines @@
   }
 
   EXPECT_TRUE(document().styleEngine().hasViewportDependentMediaQueries());
 
   document().body()->removeChild(styleElement);
   document().view()->updateAllLifecyclePhases();
 
   EXPECT_FALSE(document().styleEngine().hasViewportDependentMediaQueries());
 }
 
+TEST_F(StyleEngineTest, StyleMediaAttributeStyleChange) {
+  document().body()->setInnerHTML(
+      "<style id='s1' media='(max-width: 1px)'>#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, 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);
+
+  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);
+
+  ASSERT_TRUE(t1->computedStyle());
+  EXPECT_EQ(makeRGB(0, 128, 0),
+            t1->computedStyle()->visitedDependentColor(CSSPropertyColor));
+}
+
 }  // namespace blink