Scale the ALPHA_THRESHOLD filter's region based on the device scale factor.

cc/trees/layer_tree_host_unittest_delegated.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 "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 176 matching lines @@
 
     quad->SetNew(sqs,
                  output_rect,
                  output_rect,
                  id,
                  false,  // is_replica
                  0,      // mask_resource_id
                  damage_rect,
                  gfx::Rect(0, 0, 1, 1),  // mask_uv_rect
                  filters,
-                 background_filters);
+                 background_filters,
+                 gfx::Vector2dF(1.f, 1.f));
     frame->render_pass_list[0]->quad_list.push_back(quad.PassAs<DrawQuad>());
   }
 
   static ResourceProvider::ResourceId AppendResourceId(
       std::vector<ResourceProvider::ResourceId>* resources_in_last_sent_frame,
       ResourceProvider::ResourceId resource_id) {
     resources_in_last_sent_frame->push_back(resource_id);
     return resource_id;
   }
 
@@ skipping 1985 matching lines @@
   }
 
   scoped_refptr<DelegatedRendererLayer> delegated_thief_;
 };
 
 SINGLE_AND_MULTI_THREAD_TEST_F(
     LayerTreeHostDelegatedTestRemoveAndChangeResources);
 
 }  // namespace
 }  // namespace cc