Deferred frame loading stats v2

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

Index: third_party/WebKit/Source/core/dom/Document.h
diff --git a/third_party/WebKit/Source/core/dom/Document.h b/third_party/WebKit/Source/core/dom/Document.h
index 474ff9128436f0d7bbf48f257d3190dda4a877c5..de31c3aeee1c586dcb965a20df49b956bbd11663 100644
--- a/third_party/WebKit/Source/core/dom/Document.h
+++ b/third_party/WebKit/Source/core/dom/Document.h
@@ -235,6 +235,19 @@ enum CreateElementFlags {
   CreatedByFragmentParser = CreatedByParser | AsynchronousCustomElements,
 };
 
+// Logged to UMA, so don't re-arrange them without creating a new histogram.
+enum WouldLoadReason {
+  Created,
+  WouldLoadDisplayNone,
+  WouldLoadOutOfProcess,
+  WouldLoadZeroByZero,
+  WouldLoadAbove,
+  WouldLoadLeft,
+  WouldLoadVisible,
+
+  WouldLoadReasonEnd
+};
+
 using DocumentClassFlags = unsigned char;
 
 class CORE_EXPORT Document : public ContainerNode,
@@ -1275,7 +1288,8 @@ class CORE_EXPORT Document : public ContainerNode,
 
   bool isInMainFrame() const;
 
-  void onVisibilityMaybeChanged(bool visible);
+  void wouldLoadBecause(WouldLoadReason);
+  WouldLoadReason wouldLoadReason() { return m_wouldLoadReason; }
 
   PropertyRegistry* propertyRegistry();
 
@@ -1629,7 +1643,7 @@ class CORE_EXPORT Document : public ContainerNode,
 
   Member<SnapCoordinator> m_snapCoordinator;
 
-  bool m_visibilityWasLogged;
+  WouldLoadReason m_wouldLoadReason;
 
   Member<PropertyRegistry> m_propertyRegistry;
 };