Reenable IOSurfaces for Canvas on Mac.

third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h

Index: third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h
diff --git a/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h b/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h
index ea9fac95f94649a224a41059b3774c35203f7cc1..4beacbc9aeda756ed425744e984bd03071443cf2 100644
--- a/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h
+++ b/third_party/WebKit/Source/platform/graphics/Canvas2DLayerBridge.h
@@ -67,10 +67,7 @@ class SharedContextRateLimiter;
 #define CANVAS2D_HIBERNATION_ENABLED 0
 
 // IOSurfaces are a primitive only present on OS X.
-// IOSurfaces can't be used right now because the compositor returns them while
-// they are they still in use by the Window Server, and the SyncToken isn't
-// relevant. https://crbug.com/608026.
-#define USE_IOSURFACE_FOR_2D_CANVAS 0
+#define USE_IOSURFACE_FOR_2D_CANVAS 1
 #else
 #define CANVAS2D_HIBERNATION_ENABLED 1
 #define USE_IOSURFACE_FOR_2D_CANVAS 0