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..8f7913bb928d8a52a7417072582dfd7d57bde07d 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;

[esprehn, 2015/10/14 22:09:46]

You want to add a ThrottleScope, just like the DetachScope. You don't need the
mode enum at all, just use an integer you increment/decrement. That avoids
having nested calls to something unset it by mistake.

[Sami, 2015/10/16 16:48:08]

Done.

+
 #if ENABLE(ASSERT)
     static const char* stateAsDebugString(const State);
 #endif