Timeline: show white overlay till page being reloaded paints

third_party/WebKit/Source/web/WebDevToolsAgentImpl.h

Index: third_party/WebKit/Source/web/WebDevToolsAgentImpl.h
diff --git a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.h b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.h
index d1c5da2cb538bc17319c98bd66b21bea764fee68..0b3e961cb38906240554e48a087dc8da9cb904c0 100644
--- a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.h
+++ b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.h
@@ -95,6 +95,7 @@ public:
     void willAddPageOverlay(const GraphicsLayer*);
     void didRemovePageOverlay(const GraphicsLayer*);
     void layerTreeViewChanged(WebLayerTreeView*);
+    void rootLayerCleared();
 
     // WebDevToolsAgent implementation.
     void attach(const WebString& hostId, int sessionId) override;
@@ -120,6 +121,8 @@ private:
     void pageLayoutInvalidated(bool resized) override;
     void configureOverlay(bool suspended, const String& message) override;
     void waitForCreateWindow(LocalFrame*) override;
+    void willReloadPage() override;
+
 
     // InspectorSession::Client implementation.
     void sendProtocolMessage(int sessionId, int callId, const String& response, const String& state) override;
@@ -153,8 +156,9 @@ private:
     Member<InspectorTracingAgent> m_tracingAgent;
 
     Member<InspectorSession> m_session;
-    bool m_includeViewAgents;
     int m_layerTreeId;
+    bool m_includeViewAgents;
+    bool m_tracingActive;
 };
 
 } // namespace blink