Throttle rendering pipeline for invisible frames

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

Index: third_party/WebKit/Source/core/dom/DocumentLifecycle.h
diff --git a/third_party/WebKit/Source/core/dom/DocumentLifecycle.h b/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
index d111b1d694812eb3fb15ba74d66621215011e02b..8fec25d3483d72b9bf86f814c0132dbfa07ea431 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
@@ -134,6 +134,14 @@ public:
         DocumentLifecycle& m_documentLifecycle;
     };
 
+    class PreventThrottlingScope {
+        STACK_ALLOCATED();
+        WTF_MAKE_NONCOPYABLE(PreventThrottlingScope);
+    public:
+        PreventThrottlingScope(DocumentLifecycle&);
+        ~PreventThrottlingScope();
+    };
+
     DocumentLifecycle();
     ~DocumentLifecycle();
 
@@ -157,6 +165,8 @@ public:
         m_detachCount--;
     }
 
+    bool throttlingAllowed() const;
+
 #if ENABLE(ASSERT)
     static const char* stateAsDebugString(const State);
 #endif