Throttle rendering pipeline for invisible iframes

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

Index: third_party/WebKit/Source/core/paint/ViewPainter.cpp
diff --git a/third_party/WebKit/Source/core/paint/ViewPainter.cpp b/third_party/WebKit/Source/core/paint/ViewPainter.cpp
index 9feee6fa57d7bd0a78e304e8956ec46f9fbcef80..10ab8fc21e500a7fff413da9cbab22682db0800f 100644
--- a/third_party/WebKit/Source/core/paint/ViewPainter.cpp
+++ b/third_party/WebKit/Source/core/paint/ViewPainter.cpp
@@ -25,6 +25,10 @@ void ViewPainter::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffs
     // LayoutViews should never be called to paint with an offset not on device pixels.
     ASSERT(LayoutPoint(IntPoint(paintOffset.x(), paintOffset.y())) == paintOffset);
 
+    const FrameView* frameView = m_layoutView.frameView();
+    if (frameView->shouldThrottleRenderingPipeline())
+        return;
+
     m_layoutView.paintObject(paintInfo, paintOffset);
     BlockPainter(m_layoutView).paintOverflowControlsIfNeeded(paintInfo, paintOffset);
 }