cc: Don't make tiles for mask layers that are too big for a texture.

cc/layers/picture_layer.cc

Index: cc/layers/picture_layer.cc
diff --git a/cc/layers/picture_layer.cc b/cc/layers/picture_layer.cc
index 8b8558ce7f4e59654cd85c257b19755ec04c469e..4207aa248142ba0174101773a7b38bd89ff61af4 100644
--- a/cc/layers/picture_layer.cc
+++ b/cc/layers/picture_layer.cc
@@ -21,7 +21,6 @@ PictureLayer::PictureLayer(ContentLayerClient* client)
     : client_(client),
       pile_(make_scoped_refptr(new PicturePile())),
       instrumentation_object_tracker_(id()),
-      is_mask_(false),
       update_source_frame_number_(-1),
       can_use_lcd_text_last_frame_(can_use_lcd_text()) {
 }
@@ -50,8 +49,6 @@ void PictureLayer::PushPropertiesTo(LayerImpl* base_layer) {
     DCHECK_EQ(layer_impl->bounds().ToString(), pile_->tiling_size().ToString());
   }
 
-  layer_impl->SetIsMask(is_mask_);
-
   // Unlike other properties, invalidation must always be set on layer_impl.
   // See PictureLayerImpl::PushPropertiesTo for more details.
   layer_impl->invalidation_.Clear();
@@ -149,7 +146,7 @@ bool PictureLayer::Update(ResourceUpdateQueue* queue,
 }
 
 void PictureLayer::SetIsMask(bool is_mask) {
-  is_mask_ = is_mask;
+  pile_->set_is_mask(is_mask);
 }
 
 Picture::RecordingMode PictureLayer::RecordingMode() const {