cc: Fix non root copy request visible rect in HighDPI

cc/test/layer_tree_host_common_test.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/test/layer_tree_host_common_test.h"
 
 #include <stddef.h>
 
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_impl.h"
@@ skipping 155 matching lines @@
       can_render_to_separate_surface,
       root_layer->layer_tree_impl()->property_trees(),
       update_layer_list_impl_.get());
 }
 
 void LayerTreeHostCommonTestBase::ExecuteCalculateDrawProperties(
     LayerImpl* root_layer,
     float device_scale_factor,
     float page_scale_factor,
     LayerImpl* page_scale_layer) {
+  if (device_scale_factor !=
+      root_layer->layer_tree_impl()->device_scale_factor())
+    root_layer->layer_tree_impl()->property_trees()->needs_rebuild = true;
+
   root_layer->layer_tree_impl()->SetDeviceScaleFactor(device_scale_factor);
 
   EXPECT_TRUE(page_scale_layer || (page_scale_factor == 1.f));
 
   gfx::Transform identity_matrix;
   gfx::Size device_viewport_size =
       gfx::Size(root_layer->bounds().width() * device_scale_factor,
                 root_layer->bounds().height() * device_scale_factor);
 
   render_surface_layer_list_impl_.reset(new LayerImplList);
@@ skipping 38 matching lines @@
 
 LayerTreeHostCommonTest::LayerTreeHostCommonTest()
     : LayerTreeHostCommonTestBase(LayerTreeSettings()) {}
 
 LayerTreeHostCommonTest::LayerTreeHostCommonTest(
     const LayerTreeSettings& settings)
     : LayerTreeHostCommonTestBase(settings) {
 }
 
 }  // namespace cc