Don't promote position: fixed elements with composited descendants if they don't scroll

third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG

Index: third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG
diff --git a/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG b/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG
index b8e8094e15b7d95bea772929d2a35ea678ef88ca..b55a71ed47d880d45581dd2e3d4f1751c6461afe 100644
--- a/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG
+++ b/third_party/WebKit/LayoutTests/FlagExpectations/enable-blink-features=LayoutNG
@@ -541,7 +541,6 @@ crbug.com/591099 canvas/philip/tests/2d.fillStyle.parse.invalid.rgba-7.html [ Cr
 crbug.com/591099 canvas/philip/tests/2d.pattern.image.incomplete.empty.html [ Crash ]
 crbug.com/591099 canvas/philip/tests/2d.pattern.image.incomplete.omitted.html [ Crash ]
 crbug.com/591099 compositing/3d-corners.html [ Failure ]
-crbug.com/591099 compositing/always-composite-fixed-position-when-descendants-composite.html [ Failure ]
 crbug.com/591099 compositing/animation/busy-indicator.html [ Failure ]
 crbug.com/591099 compositing/animation/hidden-composited.html [ Failure ]
 crbug.com/591099 compositing/backface-visibility/backface-visibility-image.html [ Failure ]
@@ -554,6 +553,7 @@ crbug.com/591099 compositing/change-preferCompositingToLCDText-setting.html [ Fa
 crbug.com/591099 compositing/checkerboard.html [ Failure ]
 crbug.com/591099 compositing/child-transform-layer-requires-box.html [ Failure ]
 crbug.com/591099 compositing/columns/geometry-map-paginated-assert.html [ Failure ]
+crbug.com/591099 compositing/composite-scrollable-fixed-position-when-descendants-composite.html [ Failure ]
 crbug.com/591099 compositing/composited-negative-zindex-child.html [ Failure ]
 crbug.com/591099 compositing/compositing-visible-descendant.html [ Failure ]
 crbug.com/591099 compositing/contents-opaque/body-background-painted.html [ Failure ]
@@ -19816,7 +19816,6 @@ crbug.com/591099 virtual/android/fullscreen/video-fail-to-enter-full-screen.html
 crbug.com/591099 virtual/android/fullscreen/video-fixed-at-top-left.html [ Failure ]
 crbug.com/591099 virtual/android/media/mediadocument/media-document-with-download-button.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/3d-corners.html [ Failure ]
-crbug.com/591099 virtual/disable-spinvalidation/compositing/always-composite-fixed-position-when-descendants-composite.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/animation/busy-indicator.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/animation/hidden-composited.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/backface-visibility/backface-visibility-image.html [ Failure ]
@@ -19829,6 +19828,7 @@ crbug.com/591099 virtual/disable-spinvalidation/compositing/change-preferComposi
 crbug.com/591099 virtual/disable-spinvalidation/compositing/checkerboard.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/child-transform-layer-requires-box.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/columns/geometry-map-paginated-assert.html [ Failure ]
+crbug.com/591099 virtual/disable-spinvalidation/compositing/composite-scrollable-fixed-position-when-descendants-composite.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/composited-negative-zindex-child.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/compositing-visible-descendant.html [ Failure ]
 crbug.com/591099 virtual/disable-spinvalidation/compositing/contents-opaque/body-background-painted.html [ Failure ]