Disallow throttling while running requestAnimationFrame callbacks

third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp

Index: third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
diff --git a/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp b/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
index efd0ecea0262ab79cf42eb6d800781855dff5ee2..2982c671cf98213f0b8bb1e64c16475f204f8e6d 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp
@@ -76,6 +76,17 @@ DocumentLifecycle::AllowThrottlingScope::~AllowThrottlingScope()
     s_allowThrottlingCount--;
 }
 
+DocumentLifecycle::DisallowThrottlingScope::DisallowThrottlingScope(DocumentLifecycle& lifecycle)
+{
+    m_savedCount = s_allowThrottlingCount;
+    s_allowThrottlingCount = 0;
+}
+
+DocumentLifecycle::DisallowThrottlingScope::~DisallowThrottlingScope()
+{
+    s_allowThrottlingCount = m_savedCount;
+}
+
 DocumentLifecycle::DocumentLifecycle()
     : m_state(Uninitialized)
     , m_detachCount(0)