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..b299e2647c524ae8301381d7318b7034fa2a3634 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
@@ -134,6 +134,8 @@ public:
         DocumentLifecycle& m_documentLifecycle;
     };
 
+    enum class ThrottlingMode { Disallow, Allow };
+
     DocumentLifecycle();
     ~DocumentLifecycle();
 
@@ -157,6 +159,9 @@ public:
         m_detachCount--;
     }
 
+    void setThrottlingMode(ThrottlingMode);
+    ThrottlingMode throttlingMode() const;
+
 #if ENABLE(ASSERT)
     static const char* stateAsDebugString(const State);
 #endif
@@ -169,6 +174,7 @@ private:
 
     State m_state;
     int m_detachCount;
+    ThrottlingMode m_throttlingMode;
 };
 
 inline bool DocumentLifecycle::stateAllowsTreeMutations() const