Throttle rendering pipeline for invisible iframes

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 fae9797b7412a84a7b64a592bdd20302f5e3b5d4..ca88f2f3dbfd0b4dac2718dfc23b0f1ad92749b7 100644
--- a/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
+++ b/third_party/WebKit/Source/core/dom/DocumentLifecycle.h
@@ -127,6 +127,8 @@ public:
         DocumentLifecycle& m_documentLifecycle;
     };
 
+    enum class ThrottlingMode { Disallow, Allow };
+
     DocumentLifecycle();
     ~DocumentLifecycle();
 
@@ -150,6 +152,9 @@ public:
         m_detachCount--;
     }
 
+    void setThrottlingMode(ThrottlingMode);
+    ThrottlingMode throttlingMode() const;
+
 private:
 #if ENABLE(ASSERT)
     bool canAdvanceTo(State) const;
@@ -158,6 +163,7 @@ private:
 
     State m_state;
     int m_detachCount;
+    ThrottlingMode m_throttlingMode;
 };
 
 inline bool DocumentLifecycle::stateAllowsTreeMutations() const