Throttle rendering pipeline for invisible frames

third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp b/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
index 6aa124823e87b7dca13e33f0cf0d8f9728cae97a..5c70302f2d76f952e4f4add44c1bbc2c5430dab2 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerPainter.cpp
@@ -8,6 +8,7 @@
 #include "core/frame/Settings.h"
 #include "core/layout/ClipPathOperation.h"
 #include "core/layout/LayoutBlock.h"
+#include "core/layout/LayoutFrame.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/svg/LayoutSVGResourceClipper.h"
 #include "core/page/Page.h"
@@ -86,6 +87,10 @@ PaintLayerPainter::PaintResult PaintLayerPainter::paintLayerInternal(GraphicsCon
     if (shouldSuppressPaintingLayer(&m_paintLayer))
         return FullyPainted;
 
+    // TODO(skyostil): Unify this early-out logic with subsequence caching.
+    if (m_paintLayer.layoutObject()->isLayoutPart() && toLayoutPart(m_paintLayer.layoutObject())->isThrottledFrameView())
+        return FullyPainted;
+
     // If this layer is totally invisible then there is nothing to paint.
     if (!m_paintLayer.layoutObject()->opacity() && !m_paintLayer.layoutObject()->hasBackdropFilter())
         return FullyPainted;
@@ -220,6 +225,10 @@ PaintLayerPainter::PaintResult PaintLayerPainter::paintLayerContentsInternal(Gra
     if (paintFlags & PaintLayerPaintingRootBackgroundOnly && !m_paintLayer.layoutObject()->isLayoutView() && !m_paintLayer.layoutObject()->isDocumentElement())
         return result;
 
+    // TODO(skyostil): Unify this early-out logic with subsequence caching.
+    if (m_paintLayer.layoutObject()->isLayoutPart() && toLayoutPart(m_paintLayer.layoutObject())->isThrottledFrameView())
+        return FullyPainted;
+
     PaintLayerPaintingInfo paintingInfo = paintingInfoArg;
 
     // Ensure our lists are up-to-date.