cc: Distinguish single texture mask from normal masks

cc/trees/layer_tree_host_pixeltest_blending.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 
 #include "cc/layers/picture_image_layer.h"
 #include "cc/layers/solid_color_layer.h"
 #include "cc/test/layer_tree_pixel_resource_test.h"
 #include "cc/test/pixel_comparator.h"
@@ skipping 136 matching lines @@
     layer->SetBounds(gfx::Size(width, height));
     layer->SetImage(backing_store->makeImageSnapshot());
     return layer;
   }
 
   void SetupMaskLayer(scoped_refptr<Layer> layer) {
     const int kMaskOffset = 2;
     gfx::Size bounds = layer->bounds();
     scoped_refptr<PictureImageLayer> mask = PictureImageLayer::Create();
     mask->SetIsDrawable(true);
-    mask->SetIsMask(true);
+    mask->SetLayerMaskType(Layer::LayerMaskType::MULTI_TEXTURE_MASK);
     mask->SetBounds(bounds);
 
     sk_sp<SkSurface> surface =
         SkSurface::MakeRasterN32Premul(bounds.width(), bounds.height());
     SkCanvas* canvas = surface->getCanvas();
     SkPaint paint;
     paint.setColor(SK_ColorWHITE);
     canvas->clear(SK_ColorTRANSPARENT);
     canvas->drawRect(SkRect::MakeXYWH(kMaskOffset, kMaskOffset,
                                       bounds.width() - kMaskOffset * 2,
@@ skipping 332 matching lines @@
   RunBlendingWithRenderPass(
       GL_ZERO_COPY_RECT_DRAW,
       FILE_PATH_LITERAL("blending_render_pass_mask.png"),
       kUseMasks | kUseAntialiasing | kUseColorMatrix | kForceShaders);
 }
 
 }  // namespace
 }  // namespace cc
 
 #endif  // OS_ANDROID