cc: Enable composited border-radius scrolling.

cc/layers/render_surface_impl.cc

 // Copyright 2011 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 <algorithm>
 
@@ skipping 385 matching lines @@
   PictureLayerImpl* mask_layer = static_cast<PictureLayerImpl*>(MaskLayer());
   // Resourceless mode does not support masks.
   if (draw_mode != DRAW_MODE_RESOURCELESS_SOFTWARE && mask_layer &&
       mask_layer->DrawsContent() && !mask_layer->bounds().IsEmpty()) {
     // The software renderer applies mask layer and blending in the wrong
     // order but kDstIn doesn't commute with masking. It is okay to not
     // support this configuration because kDstIn was introduced to replace
     // mask layers.
     DCHECK(BlendMode() != SkBlendMode::kDstIn)
         << "kDstIn blend mode with mask layer is unsupported.";
+    TRACE_EVENT1("cc", "RenderSurfaceImpl::AppendQuads",
+                 "mask_layer_gpu_memory_usage",
+                 mask_layer->GPUMemoryUsageInBytes());
     if (mask_layer->mask_type() == Layer::LayerMaskType::MULTI_TEXTURE_MASK) {
       TileMaskLayer(render_pass, shared_quad_state, visible_layer_rect);
       return;
     }
     gfx::SizeF mask_uv_size;
     mask_layer->GetContentsResourceId(&mask_resource_id, &mask_texture_size,
                                       &mask_uv_size);
     gfx::SizeF unclipped_mask_target_size = gfx::ScaleSize(
         gfx::SizeF(OwningEffectNode()->unscaled_mask_target_size),
         surface_contents_scale.x(), surface_contents_scale.y());
@@ skipping 118 matching lines @@
         NOTIMPLEMENTED();
         break;
       default:
         NOTREACHED();
         break;
     }
   }
 }
 
 }  // namespace cc