Don't animate a progress bar if it isn't animated

third_party/WebKit/Source/core/layout/LayoutProgress.h

Index: third_party/WebKit/Source/core/layout/LayoutProgress.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutProgress.h b/third_party/WebKit/Source/core/layout/LayoutProgress.h
index c8d8abf48dbc3ff22cb864e72e76a7afcf12740c..1f14d0f1fc53d7edf85cae71f94c6eef977253c4 100644
--- a/third_party/WebKit/Source/core/layout/LayoutProgress.h
+++ b/third_party/WebKit/Source/core/layout/LayoutProgress.h
@@ -46,6 +46,8 @@ public:
 protected:
     void willBeDestroyed() override;
 
+    bool isAnimationTimerActive() const;
+
 private:
     bool isOfType(LayoutObjectType type) const override { return type == LayoutObjectProgress || LayoutBlockFlow::isOfType(type); }
 
@@ -58,6 +60,8 @@ private:
     double m_animationDuration;
     bool m_animating;
     Timer<LayoutProgress> m_animationTimer;
+
+    friend class LayoutProgressTest;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutProgress, isProgress());