cc: Distinguish single texture mask from normal masks

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 0016527f3f4906bfda7a9927580d17870eb3b918..56e2d7a28101900745400a5f1f570e11e072659a 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -313,6 +313,7 @@ class CC_EXPORT Layer : public base::RefCounted<Layer> {
   // Returns true iff anything was updated that needs to be committed.
   virtual bool Update();
   virtual void SetIsMask(bool is_mask) {}

[enne (OOO), 2017/02/09 18:37:06]

Sorry for the API nit, but because these two functions are related and some
combinations don't make sense, like IsSingleTextureMask(true) and IsMask(false),
but can you make this SetMaskType with an enum of NO_MASK, SINGLE_TEXTURE_MASK,
... MASK? (not sure what to call the normal type).

+  virtual void SetIsSingleTextureMask(bool is_single_texture_mask_) {}
   virtual bool IsSuitableForGpuRasterization() const;
 
   virtual std::unique_ptr<base::trace_event::ConvertableToTraceFormat>