Move "prePaint" under the "Update Layer Tree" devtools timeline step

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 20aa9f46aa577f6803618959df897b0057191936..e4a1a4ecb0a60857a138b8718f4f55176fd7b911 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -2938,10 +2938,12 @@ void FrameView::updateLifecyclePhasesInternal(
 
         updateCompositedSelectionIfNeeded();
       }
-    }
 
-    if (targetState >= DocumentLifecycle::PrePaintClean)
-      prePaint();
+      // TODO(pdr): prePaint should be under the "Paint" devtools timeline step
+      // for slimming paint v2.
+      if (targetState >= DocumentLifecycle::PrePaintClean)
+        prePaint();
+    }
 
     if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
       DocumentAnimations::updateAnimations(layoutView()->document());