Throttle rendering pipeline for invisible iframes

Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp

Index: Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
diff --git a/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp b/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
index 7f50b0f64c6a861ba8f197f6b2e85458a96d4793..ceb603cce62252f8ff3d4dc22317b940d83016ab 100644
--- a/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
+++ b/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
@@ -194,6 +194,10 @@ void updateDescendantDependentFlagsForEntireSubtree(DeprecatedPaintLayer& layer)
 
 void DeprecatedPaintLayerCompositor::updateIfNeededRecursive()
 {
+    FrameView* view = m_layoutView.frameView();
+    if (view->shouldThrottleStyleLayoutAndCompositingUpdates())
+        return;
+
     for (Frame* child = m_layoutView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling()) {
         if (!child->isLocalFrame())
             continue;
@@ -238,8 +242,12 @@ void DeprecatedPaintLayerCompositor::updateIfNeededRecursive()
     ASSERT(lifecycle().state() == DocumentLifecycle::CompositingClean);
     assertNoUnresolvedDirtyBits();
     for (Frame* child = m_layoutView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling()) {
-        if (child->isLocalFrame())
-            toLocalFrame(child)->contentLayoutObject()->compositor()->assertNoUnresolvedDirtyBits();
+        if (!child->isLocalFrame())
+            continue;
+        LocalFrame* localFrame = toLocalFrame(child);
+        if (localFrame->shouldThrottleStyleLayoutAndCompositingUpdates())
+            continue;
+        localFrame->contentLayoutObject()->compositor()->assertNoUnresolvedDirtyBits();
     }
 #endif
 }
@@ -608,7 +616,7 @@ bool DeprecatedPaintLayerCompositor::scrollingLayerDidChange(DeprecatedPaintLaye
 
 String DeprecatedPaintLayerCompositor::layerTreeAsText(LayerTreeFlags flags)
 {
-    ASSERT(lifecycle().state() >= DocumentLifecycle::PaintInvalidationClean);
+    ASSERT(lifecycle().state() >= DocumentLifecycle::PaintInvalidationClean || (m_layoutView.frameView() && m_layoutView.frameView()->shouldThrottleRenderingPipeline()));
 
     if (!m_rootContentLayer)
         return String();
@@ -872,12 +880,15 @@ void DeprecatedPaintLayerCompositor::resetTrackedPaintInvalidationRects()
 void DeprecatedPaintLayerCompositor::setTracksPaintInvalidations(bool tracksPaintInvalidations)
 {
 #if ENABLE(ASSERT)
+    FrameView* view = m_layoutView.frameView();
     if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
         ASSERT(lifecycle().state() == DocumentLifecycle::CompositingForSlimmingPaintV2Clean
             // TODO(wangxianzhu): Remove this when we remove the old path for spv2.
-            || lifecycle().state() == DocumentLifecycle::PaintInvalidationClean);
+            || lifecycle().state() == DocumentLifecycle::PaintInvalidationClean
+            || (view && view->shouldThrottleRenderingPipeline()));
     } else {
-        ASSERT(lifecycle().state() == DocumentLifecycle::PaintInvalidationClean);
+        ASSERT(lifecycle().state() == DocumentLifecycle::PaintInvalidationClean
+            || (view && view->shouldThrottleRenderingPipeline()));
     }
 #endif