No forced active stylesheet recollect when pending sheets reach 0.

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index e512e9cff7ca5069b9cac28a228ee8c15dc846bb..3d279fae1322058269df0c9643c639e34d2117c9 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -3677,8 +3677,13 @@ void Document::notifyResizeForViewportUnits() {
 }
 
 void Document::styleResolverMayHaveChanged() {

[rune, 2016/11/15 10:39:03]

This is a confusing name for this method, but I haven't found a good name for it
yet. It means something along the lines of:

invalidateStyleUpdateActiveStyleSheetsAndMakeSureSuppressedPaintInvalidationsTriggerAfter(Script/Render)BlockingResourcesFinishedLoading();

[meade_UTC10, 2016/11/16 18:10:31]

D: 

-  styleEngine().resolverChanged(
-      hasNodesWithPlaceholderStyle() ? FullStyleUpdate : AnalyzedStyleUpdate);
+  styleEngine().resolverChanged(AnalyzedStyleUpdate);
+
+  if (hasNodesWithPlaceholderStyle()) {
+    setNeedsStyleRecalc(SubtreeStyleChange,
+                        StyleChangeReasonForTracing::create(
+                            StyleChangeReason::CleanupPlaceholderStyles));
+  }
 
   if (didLayoutWithPendingStylesheets() &&
       !styleEngine().hasPendingScriptBlockingSheets()) {