Disallow throttling while running requestAnimationFrame callbacks

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

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 58 matching lines @@
 {
     s_allowThrottlingCount++;
 }
 
 DocumentLifecycle::AllowThrottlingScope::~AllowThrottlingScope()
 {
     DCHECK_GT(s_allowThrottlingCount, 0u);
     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)
 {
 }
 
 DocumentLifecycle::~DocumentLifecycle()
 {
 }
 
@@ skipping 234 matching lines @@
         DEBUG_STRING_CASE(Stopping);
         DEBUG_STRING_CASE(Stopped);
     }
 
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 #endif
 
 } // namespace blink