Add DisplayCompositorTest.

services/ui/surfaces/display_compositor.cc

 // Copyright 2015 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 "services/ui/surfaces/display_compositor.h"
 
+#include <utility>
+
 #include "cc/output/in_process_context_provider.h"
 #include "cc/surfaces/surface.h"
 #include "gpu/command_buffer/client/shared_memory_limits.h"
 #include "gpu/ipc/gpu_in_process_thread_service.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/ui/surfaces/gpu_compositor_frame_sink.h"
 
 namespace ui {
 
 DisplayCompositor::DisplayCompositor(
     scoped_refptr<gpu::InProcessCommandBuffer::Service> gpu_service,
     std::unique_ptr<MusGpuMemoryBufferManager> gpu_memory_buffer_manager,
     gpu::ImageFactory* image_factory,
     cc::mojom::DisplayCompositorRequest request,
     cc::mojom::DisplayCompositorClientPtr client)
     : gpu_service_(std::move(gpu_service)),
       gpu_memory_buffer_manager_(std::move(gpu_memory_buffer_manager)),
       image_factory_(image_factory),
       client_(std::move(client)),
+      reference_manager_(&manager_),
       binding_(this, std::move(request)) {
   manager_.AddObserver(this);
 }
 
 void DisplayCompositor::CreateCompositorFrameSink(
     const cc::FrameSinkId& frame_sink_id,
     gpu::SurfaceHandle surface_handle,
     cc::mojom::MojoCompositorFrameSinkRequest request,
     cc::mojom::MojoCompositorFrameSinkPrivateRequest private_request,
     cc::mojom::MojoCompositorFrameSinkClientPtr client) {
   // We cannot create more than one CompositorFrameSink with a given
   // |frame_sink_id|.
   DCHECK_EQ(0u, compositor_frame_sinks_.count(frame_sink_id));
   scoped_refptr<cc::InProcessContextProvider> context_provider;
   if (surface_handle != gpu::kNullSurfaceHandle) {
     context_provider = new cc::InProcessContextProvider(
         gpu_service_, surface_handle, gpu_memory_buffer_manager_.get(),
         image_factory_, gpu::SharedMemoryLimits(),
         nullptr /* shared_context */);
   }
   compositor_frame_sinks_[frame_sink_id] =
       base::MakeUnique<GpuCompositorFrameSink>(
           this, frame_sink_id, surface_handle, gpu_memory_buffer_manager_.get(),
           std::move(context_provider), std::move(request),
           std::move(private_request), std::move(client));
 }
 
 void DisplayCompositor::AddRootSurfaceReference(const cc::SurfaceId& child_id) {
-  AddSurfaceReference(manager_.GetRootSurfaceId(), child_id);
+  AddSurfaceReference(GetRootSurfaceId(), child_id);
 }
 
 void DisplayCompositor::AddSurfaceReference(const cc::SurfaceId& parent_id,
                                             const cc::SurfaceId& child_id) {
   auto vector_iter = temp_references_.find(child_id.frame_sink_id());
 
   // If there are no temporary references for the FrameSinkId then we can just
   // add reference and return.
   if (vector_iter == temp_references_.end()) {
-    manager_.AddSurfaceReference(parent_id, child_id);
+    reference_manager_->AddSurfaceReference(parent_id, child_id);
     return;
   }
 
   // Get the vector<LocalFrameId> for the appropriate FrameSinkId and look for
   // |child_id.local_frame_id| in that vector. If found, there is a temporary
   // reference to |child_id|.
   std::vector<cc::LocalFrameId>& refs = vector_iter->second;
   auto temp_ref_iter =
       std::find(refs.begin(), refs.end(), child_id.local_frame_id());
 
   if (temp_ref_iter == refs.end()) {
-    manager_.AddSurfaceReference(parent_id, child_id);
+    reference_manager_->AddSurfaceReference(parent_id, child_id);
     return;
   }
 
   // All surfaces get a temporary reference to the top level root. If the parent
   // wants to add a reference to the top level root then we do nothing.
   // Otherwise remove the temporary reference and add the reference.
-  if (parent_id != manager_.GetRootSurfaceId()) {
-    manager_.AddSurfaceReference(parent_id, child_id);
-    manager_.RemoveSurfaceReference(manager_.GetRootSurfaceId(), child_id);
+  if (parent_id != GetRootSurfaceId()) {
+    reference_manager_->AddSurfaceReference(parent_id, child_id);
+    reference_manager_->RemoveSurfaceReference(GetRootSurfaceId(), child_id);
   }
 
   // Remove temporary references for surfaces with the same FrameSinkId that
   // were created before |child_id|. The earlier surfaces were never embedded in
   // the parent and the parent is embedding a later surface, so we know the
   // parent doesn't need them anymore.
   for (auto iter = refs.begin(); iter != temp_ref_iter; ++iter) {
     cc::SurfaceId id = cc::SurfaceId(child_id.frame_sink_id(), *iter);
-    manager_.RemoveSurfaceReference(manager_.GetRootSurfaceId(), id);
+    reference_manager_->RemoveSurfaceReference(GetRootSurfaceId(), id);
   }
 
   // Remove markers for temporary references up to |child_id|, as the temporary
   // references they correspond to were removed above. If |ref_iter| is the last
   // element in |refs| then we are removing all temporary references for the
   // FrameSinkId and can remove the map entry entirely.
   if (++temp_ref_iter == refs.end())
     temp_references_.erase(child_id.frame_sink_id());
   else
     refs.erase(refs.begin(), ++temp_ref_iter);
 }
 
 void DisplayCompositor::RemoveRootSurfaceReference(
     const cc::SurfaceId& child_id) {
-  RemoveSurfaceReference(manager_.GetRootSurfaceId(), child_id);
+  RemoveSurfaceReference(GetRootSurfaceId(), child_id);
 }
 
 void DisplayCompositor::RemoveSurfaceReference(const cc::SurfaceId& parent_id,
                                                const cc::SurfaceId& child_id) {
   // TODO(kylechar): Each remove reference can trigger GC, it would be better if
   // we GC only once if removing multiple references.
-  manager_.RemoveSurfaceReference(parent_id, child_id);
+  reference_manager_->RemoveSurfaceReference(parent_id, child_id);
 }
 
 DisplayCompositor::~DisplayCompositor() {
   // Remove all temporary references on shutdown.
   for (auto& map_entry : temp_references_) {
     const cc::FrameSinkId& frame_sink_id = map_entry.first;
     for (auto& local_frame_id : map_entry.second) {
-      manager_.RemoveSurfaceReference(
-          manager_.GetRootSurfaceId(),
-          cc::SurfaceId(frame_sink_id, local_frame_id));
+      reference_manager_->RemoveSurfaceReference(
+          GetRootSurfaceId(), cc::SurfaceId(frame_sink_id, local_frame_id));
     }
   }
   manager_.RemoveObserver(this);
 }
 
 void DisplayCompositor::OnCompositorFrameSinkClientConnectionLost(
     const cc::FrameSinkId& frame_sink_id,
     bool destroy_compositor_frame_sink) {
   if (destroy_compositor_frame_sink)
     compositor_frame_sinks_.erase(frame_sink_id);
   // TODO(fsamuel): Tell the display compositor host that the client connection
   // has been lost so that it can drop its private connection and allow a new
   // client instance to create a new CompositorFrameSink.
 }
 
 void DisplayCompositor::OnCompositorFrameSinkPrivateConnectionLost(
     const cc::FrameSinkId& frame_sink_id,
     bool destroy_compositor_frame_sink) {
   if (destroy_compositor_frame_sink)
     compositor_frame_sinks_.erase(frame_sink_id);
 }
 
+const cc::SurfaceId& DisplayCompositor::GetRootSurfaceId() const {
+  return reference_manager_->GetRootSurfaceId();
+}
+
 void DisplayCompositor::OnSurfaceCreated(const cc::SurfaceId& surface_id,
                                          const gfx::Size& frame_size,
                                          float device_scale_factor) {
   // We can get into a situation where multiple CompositorFrames arrive for a
   // CompositorFrameSink before the DisplayCompositorClient can add any
   // references for the frame. When the second frame with a new size arrives,
   // the first will be destroyed and then if there are no references it will be
   // deleted during surface GC. A temporary reference, removed when a real
   // reference is received, is added to prevent this from happening.
-  manager_.AddSurfaceReference(manager_.GetRootSurfaceId(), surface_id);
+  reference_manager_->AddSurfaceReference(GetRootSurfaceId(), surface_id);
   temp_references_[surface_id.frame_sink_id()].push_back(
       surface_id.local_frame_id());
 
   if (client_)
     client_->OnSurfaceCreated(surface_id, frame_size, device_scale_factor);
 }
 
 void DisplayCompositor::OnSurfaceDamaged(const cc::SurfaceId& surface_id,
                                          bool* changed) {}
 
 }  // namespace ui