Determine mask UVs based on texture size

cc/layers/render_surface_impl_unittest.cc

 // Copyright 2014 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 "cc/layers/render_surface_impl.h"
 
 #include <stddef.h>
 
 #include "cc/layers/append_quads_data.h"
 #include "cc/quads/render_pass_draw_quad.h"
@@ skipping 51 matching lines @@
         impl.quad_list(), occluded, &partially_occluded_count);
     // The layer outputs one quad, which is partially occluded.
     EXPECT_EQ(1u, impl.quad_list().size());
     EXPECT_EQ(1u, partially_occluded_count);
   }
 }
 
 TEST(RenderSurfaceLayerImplTest, AppendQuadsWithScaledMask) {
   gfx::Size layer_size(1000, 1000);
   gfx::Size viewport_size(1000, 1000);
+  float scale_factor = 2;
   scoped_refptr<FakeRasterSource> raster_source =
       FakeRasterSource::CreateFilledSolidColor(layer_size);
 
   LayerTreeSettings settings;
   settings.layer_transforms_should_scale_layer_contents = true;
   LayerTestCommon::LayerImplTest impl(settings);
   std::unique_ptr<LayerImpl> root =
       LayerImpl::Create(impl.host_impl()->active_tree(), 2);
   std::unique_ptr<LayerImpl> surface =
       LayerImpl::Create(impl.host_impl()->active_tree(), 3);
   surface->SetBounds(layer_size);
   surface->test_properties()->force_render_surface = true;
 
   gfx::Transform scale;
-  scale.Scale(2, 2);
+  scale.Scale(scale_factor, scale_factor);
   surface->test_properties()->transform = scale;
 
-  surface->test_properties()->SetMaskLayer(FakeMaskLayerImpl::Create(
+  std::unique_ptr<FakeMaskLayerImpl> mask_layer = FakeMaskLayerImpl::Create(
       impl.host_impl()->active_tree(), 4, raster_source,
-      Layer::LayerMaskType::SINGLE_TEXTURE_MASK));
-  surface->test_properties()->mask_layer->SetDrawsContent(true);
-  surface->test_properties()->mask_layer->SetBounds(layer_size);
+      Layer::LayerMaskType::SINGLE_TEXTURE_MASK);
+  mask_layer->set_resource_size(
+      gfx::ScaleToCeiledSize(layer_size, scale_factor));
+  mask_layer->SetDrawsContent(true);
+  mask_layer->SetBounds(layer_size);
+  surface->test_properties()->SetMaskLayer(std::move(mask_layer));
 
   std::unique_ptr<LayerImpl> child =
       LayerImpl::Create(impl.host_impl()->active_tree(), 5);
   child->SetDrawsContent(true);
   child->SetBounds(layer_size);
 
   surface->test_properties()->AddChild(std::move(child));
   root->test_properties()->AddChild(std::move(surface));
   impl.host_impl()->active_tree()->SetRootLayerForTesting(std::move(root));
 
@@ skipping 13 matching lines @@
 
   DCHECK(render_pass->quad_list.front());
   const RenderPassDrawQuad* quad =
       RenderPassDrawQuad::MaterialCast(render_pass->quad_list.front());
   EXPECT_EQ(gfx::RectF(0, 0, 1, 1), quad->mask_uv_rect);
   EXPECT_EQ(gfx::Vector2dF(2.f, 2.f), quad->filters_scale);
 }
 
 }  // namespace
 }  // namespace cc