Determine a layer's IsAffectedByPageScale property without using Layer Tree

cc/layers/heads_up_display_layer_impl_unittest.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 <stddef.h>
 
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/heads_up_display_layer_impl.h"
 #include "cc/test/fake_impl_task_runner_provider.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "cc/test/test_task_graph_runner.h"
+#include "cc/trees/layer_tree_impl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 void CheckDrawLayer(HeadsUpDisplayLayerImpl* layer,
                     ResourceProvider* resource_provider,
                     DrawMode draw_mode) {
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData data;
@@ skipping 15 matching lines @@
   scoped_ptr<OutputSurface> output_surface = FakeOutputSurface::Create3d();
   FakeLayerTreeHostImpl host_impl(&task_runner_provider, &shared_bitmap_manager,
                                   &task_graph_runner);
   host_impl.CreatePendingTree();
   host_impl.SetVisible(true);
   host_impl.InitializeRenderer(output_surface.get());
   scoped_ptr<HeadsUpDisplayLayerImpl> layer =
     HeadsUpDisplayLayerImpl::Create(host_impl.pending_tree(), 1);
   layer->SetBounds(gfx::Size(100, 100));
 
+  HeadsUpDisplayLayerImpl* layer_ptr = layer.get();
+
+  layer->UpdatePropertyTreeTransform();

[ajuma, 2015/12/23 22:17:04]

This line shouldn't be needed (since property trees aren't getting built till
later).

+  host_impl.pending_tree()->SetRootLayer(std::move(layer));
+  host_impl.pending_tree()->BuildPropertyTreesForTesting();
+
   // Check regular hardware draw is ok.
-  CheckDrawLayer(
-      layer.get(), host_impl.resource_provider(), DRAW_MODE_HARDWARE);
+  CheckDrawLayer(layer_ptr, host_impl.resource_provider(), DRAW_MODE_HARDWARE);
 
   // Simulate a resource loss on transitioning to resourceless software mode.
-  layer->ReleaseResources();
+  layer_ptr->ReleaseResources();
 
   // Should skip resourceless software draw and not crash in UpdateHudTexture.
-  CheckDrawLayer(layer.get(),
-                 host_impl.resource_provider(),
+  CheckDrawLayer(layer_ptr, host_impl.resource_provider(),
                  DRAW_MODE_RESOURCELESS_SOFTWARE);
 }
 
 }  // namespace
 }  // namespace cc