Throttle rendering pipeline for invisible frames

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 15359a4fb8625690534dc216358b3b89c4b013b6..5ce201b0e0f4c9c18f095bb66a1dd1fc18419897 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -1531,7 +1531,8 @@ void Document::scheduleLayoutTreeUpdate()
     ASSERT(shouldScheduleLayoutTreeUpdate());
     ASSERT(needsLayoutTreeUpdate());
 
-    page()->animator().scheduleVisualUpdate();
+    if (!view() || !view()->shouldThrottleRenderingPipeline())
+        page()->animator().scheduleVisualUpdate();
     m_lifecycle.ensureStateAtMost(DocumentLifecycle::VisualUpdatePending);
 
     TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("devtools.timeline"), "ScheduleStyleRecalculation", TRACE_EVENT_SCOPE_THREAD, "data", InspectorRecalculateStylesEvent::data(frame()));
@@ -1788,6 +1789,9 @@ void Document::updateLayoutTree(StyleRecalcChange change)
 
 void Document::updateStyle(StyleRecalcChange change)
 {
+    if (view() && view()->shouldThrottleStyleLayoutAndCompositingUpdates())
+        return;
+
     TRACE_EVENT_BEGIN0("blink,blink_style", "Document::updateStyle");
     unsigned initialResolverAccessCount = styleEngine().resolverAccessCount();