Mark some canvas GPU layout tests as NeedsRebaseline.

third_party/WebKit/LayoutTests/TestExpectations

Index: third_party/WebKit/LayoutTests/TestExpectations
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 0c8b8db69a3a8a01d9d5220cec4f22cc12b44e15..24f58000ea0ad7687fe70bebdf32ce197607f11c 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -2357,11 +2357,11 @@ crbug.com/674858 [ Linux ] virtual/threaded/printing/offscreencanvas-webgl-print
 # Added 2016-12-22
 crbug.com/676537 fast/css/imageTileOpacity.html [ Pass Failure ]
 
-crbug.com/642376 virtual/gpu/fast/canvas/canvas-arc-circumference-fill.html [ Failure ]
-crbug.com/642376 virtual/gpu/fast/canvas/canvas-arc-circumference.html [ Failure ]
-crbug.com/642376 virtual/gpu/fast/canvas/canvas-ellipse-circumference-fill.html [ Failure ]
-crbug.com/642376 virtual/gpu/fast/canvas/canvas-ellipse-circumference.html [ Failure ]
-crbug.com/642376 virtual/gpu/fast/canvas/canvas-incremental-repaint.html [ Failure ]
+crbug.com/642376 virtual/gpu/fast/canvas/canvas-arc-circumference-fill.html [ NeedsRebaseline ]
+crbug.com/642376 virtual/gpu/fast/canvas/canvas-arc-circumference.html [ NeedsRebaseline ]
+crbug.com/642376 virtual/gpu/fast/canvas/canvas-ellipse-circumference-fill.html [ NeedsRebaseline ]
+crbug.com/642376 virtual/gpu/fast/canvas/canvas-ellipse-circumference.html [ NeedsRebaseline ]
+crbug.com/642376 virtual/gpu/fast/canvas/canvas-incremental-repaint.html [ NeedsRebaseline ]
 
 # ====== Random order flaky tests from here ======
 # These tests are flaky when run in random order, which is the default on Linux & Mac since since 2016-12-16.