Don't coerce pointers to compositor layer mappings to booleans.

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 70852af351c6429ad70e6175cf93d91c3ef5a907..ea5a41a89f952a7422b25d2c2a03743e519ff6a7 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -324,6 +324,14 @@ crbug.com/286081 inspector/debugger/long-resume-vs-reload.html [ Failure Pass Ti
 crbug.com/286287 [ Linux Mac Android ] http/tests/inspector/network/network-initiator.html [ Failure Pass ]
 crbug.com/306228 [ Win ] http/tests/inspector/network/network-initiator.html [ Pass Failure Timeout ]
 
+Bug(vollick) compositing/repaint/requires-backing-repaint.html [ NeedsRebaseline ]
+Bug(vollick) virtual/softwarecompositing/repaint/requires-backing-repaint.html [ NeedsRebaseline ]
+Bug(vollick) compositing/backing/no-backing-for-perspective.html [ NeedsRebaseline ]
+Bug(vollick) virtual/softwarecompositing/backing/no-backing-for-perspective.html [ NeedsRebaseline ]
+
+# Composited bounds updating is flaky at the moment and can result in image failures on this test.
+crbug.com/317689 transforms/3d/point-mapping/3d-point-mapping-deep.html [ Pass ImageOnlyFailure ]
+
 # Pixel captures are currently totally broken on Android Nexus4's at the moment.
 crbug.com/293932 [ Android ] css1/classification/list_style_image.html [ ImageOnlyFailure ]
 crbug.com/293932 [ Android ] css1/classification/list_style_position.html [ ImageOnlyFailure ]