Skip rule matching during animations.

Source/core/animation/ActiveAnimations.cpp

Index: Source/core/animation/ActiveAnimations.cpp
diff --git a/Source/core/animation/ActiveAnimations.cpp b/Source/core/animation/ActiveAnimations.cpp
index 586de09c0a5368685d59bb9d04f755fa34cc107a..0b8a87b55d365941e09d15e1c5db89d3c7a5d3c8 100644
--- a/Source/core/animation/ActiveAnimations.cpp
+++ b/Source/core/animation/ActiveAnimations.cpp
@@ -35,6 +35,11 @@
 
 namespace blink {
 
+ActiveAnimations::ActiveAnimations()
+    : m_animationStyleChange(false)
+{
+}
+
 ActiveAnimations::~ActiveAnimations()
 {
 #if !ENABLE(OILPAN)
@@ -85,4 +90,26 @@ void ActiveAnimations::trace(Visitor* visitor)
 #endif
 }
 
+const RenderStyle* ActiveAnimations::baseRenderStyle() const
+{
+#if !ENABLE(ASSERT)
+    if (isAnimationStyleChange())
+        return m_baseRenderStyle.get();
+#endif
+    return nullptr;
+}
+
+void ActiveAnimations::updateBaseRenderStyle(const RenderStyle* renderStyle)
+{
+    if (!isAnimationStyleChange()) {
+        m_baseRenderStyle = nullptr;
+        return;
+    }
+#if ENABLE(ASSERT)
+    if (m_baseRenderStyle && renderStyle)
+        ASSERT(*m_baseRenderStyle == *renderStyle);
+#endif
+    m_baseRenderStyle = RenderStyle::clone(renderStyle);
+}
+
 } // namespace blink