Fix partial painting with render pipeline throttling

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 5d68ff08ec5d03d29a1993c9a870a18a7d54d514..1104f2341b9a2d41a0f9d098c86efaa539ea0120 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -3699,16 +3699,11 @@ void FrameView::paint(GraphicsContext& context, const CullRect& cullRect) const
 
 void FrameView::paint(GraphicsContext& context, const GlobalPaintFlags globalPaintFlags, const CullRect& cullRect) const
 {
-    // TODO(skyostil): Remove this early-out in favor of painting cached scrollbars.
-    if (shouldThrottleRendering())
-        return;
     FramePainter(*this).paint(context, globalPaintFlags, cullRect);
 }
 
 void FrameView::paintContents(GraphicsContext& context, const GlobalPaintFlags globalPaintFlags, const IntRect& damageRect) const
 {
-    if (shouldThrottleRendering())
-        return;
     FramePainter(*this).paintContents(context, globalPaintFlags, damageRect);
 }
 
@@ -4004,8 +3999,12 @@ void FrameView::notifyRenderThrottlingObservers()
     }
 
     bool becameUnthrottled = wasThrottled && !canThrottleRendering();
-    if (becameUnthrottled)
+    if (becameUnthrottled) {
         page()->animator().scheduleVisualUpdate(m_frame.get());
+        // Force a full repaint to make sure we regenerate any cached
+        // subsequences for this frame.
+        m_doFullPaintInvalidation = true;
+    }
 }
 
 bool FrameView::shouldThrottleRendering() const