Timeline: show white overlay till page being reloaded paints

third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp

Index: third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
index 087fe335b8344806be73f37c313371bab207c1e4..90c6bdd37bf47f8952eb29afbd9875ddad580073 100644
--- a/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
+++ b/third_party/WebKit/Source/web/WebDevToolsAgentImpl.cpp
@@ -521,6 +521,12 @@ void WebDevToolsAgentImpl::didRemovePageOverlay(const GraphicsLayer* layer)
         m_layerTreeAgent->didRemovePageOverlay(layer);
 }
 
+void WebDevToolsAgentImpl::rootLayerCleared()
+{
+    if (m_overlay)
+        m_overlay->maybeClearReloadingBanner();
+}
+
 void WebDevToolsAgentImpl::layerTreeViewChanged(WebLayerTreeView* layerTreeView)
 {
     m_layerTreeId = layerTreeView ? layerTreeView->layerTreeId() : 0;
@@ -528,10 +534,12 @@ void WebDevToolsAgentImpl::layerTreeViewChanged(WebLayerTreeView* layerTreeView)
         m_tracingAgent->setLayerTreeId(m_layerTreeId);
 }
 
-void WebDevToolsAgentImpl::enableTracing(const String& categoryFilter)
+void WebDevToolsAgentImpl::enableTracing(const String& categoryFilter, const String& reloadingBannerMessage)
 {
     if (m_client)
         m_client->enableTracing(categoryFilter);
+    if (!reloadingBannerMessage.isNull() && m_overlay)
+        m_overlay->setReloadingBanner(reloadingBannerMessage);
 }
 
 void WebDevToolsAgentImpl::disableTracing()