Restore aura support from Mojo repo.

mandoline/ui/aura/surface_binding.cc

Index: mandoline/ui/aura/surface_binding.cc
diff --git a/mandoline/ui/aura/surface_binding.cc b/mandoline/ui/aura/surface_binding.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2d6540cf7a06b6daf4355c4b44ab60b197f22e80
--- /dev/null
+++ b/mandoline/ui/aura/surface_binding.cc
@@ -0,0 +1,253 @@
+// 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 "mandoline/ui/aura/surface_binding.h"
+
+#include <map>
+
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/threading/thread_local.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/output_surface.h"
+#include "cc/output/output_surface_client.h"
+#include "cc/output/software_output_device.h"
+#include "cc/resources/shared_bitmap_manager.h"
+#include "components/gpu/public/interfaces/gpu.mojom.h"
+#include "components/surfaces/public/interfaces/surfaces.mojom.h"
+#include "components/view_manager/public/cpp/view.h"
+#include "components/view_manager/public/cpp/view_manager.h"
+#include "mandoline/ui/aura/window_tree_host_mojo.h"
+#include "mojo/cc/context_provider_mojo.h"
+#include "mojo/converters/geometry/geometry_type_converters.h"
+#include "mojo/converters/surfaces/surfaces_type_converters.h"
+#include "mojo/public/cpp/application/connect.h"
+#include "mojo/public/interfaces/application/shell.mojom.h"
+
+namespace mandoline {
+namespace {
+
+// OutputSurface ---------------------------------------------------------------
+
+// OutputSurface implementation for a view. Pushes the surface id to View when
+// appropriate.
+class OutputSurfaceImpl : public cc::OutputSurface {
+ public:
+  OutputSurfaceImpl(mojo::View* view,
+                    const scoped_refptr<cc::ContextProvider>& context_provider,
+                    mojo::Surface* surface,
+                    uint32_t id_namespace,
+                    uint32_t* next_local_id);
+  ~OutputSurfaceImpl() override;
+
+  // cc::OutputSurface:
+  void SwapBuffers(cc::CompositorFrame* frame) override;
+
+ private:
+  mojo::View* view_;
+  mojo::Surface* surface_;
+  uint32_t id_namespace_;
+  uint32_t* next_local_id_;  // Owned by PerViewManagerState.
+  uint32_t local_id_;
+  gfx::Size surface_size_;
+
+  DISALLOW_COPY_AND_ASSIGN(OutputSurfaceImpl);
+};
+
+OutputSurfaceImpl::OutputSurfaceImpl(
+    mojo::View* view,
+    const scoped_refptr<cc::ContextProvider>& context_provider,
+    mojo::Surface* surface,
+    uint32_t id_namespace,
+    uint32_t* next_local_id)
+    : cc::OutputSurface(context_provider),
+      view_(view),
+      surface_(surface),
+      id_namespace_(id_namespace),
+      next_local_id_(next_local_id),
+      local_id_(0u) {
+  capabilities_.delegated_rendering = true;
+  capabilities_.max_frames_pending = 1;
+}
+
+OutputSurfaceImpl::~OutputSurfaceImpl() {
+}
+
+void OutputSurfaceImpl::SwapBuffers(cc::CompositorFrame* frame) {
+  gfx::Size frame_size =
+      frame->delegated_frame_data->render_pass_list.back()->output_rect.size();
+  if (frame_size != surface_size_) {
+    if (local_id_ != 0u)
+      surface_->DestroySurface(local_id_);
+    local_id_ = (*next_local_id_)++;
+    surface_->CreateSurface(local_id_);
+    auto qualified_id = mojo::SurfaceId::New();
+    qualified_id->local = local_id_;
+    qualified_id->id_namespace = id_namespace_;
+    view_->SetSurfaceId(qualified_id.Pass());
+    surface_size_ = frame_size;
+  }
+
+  surface_->SubmitFrame(local_id_, mojo::Frame::From(*frame), mojo::Closure());
+
+  client_->DidSwapBuffers();
+  client_->DidSwapBuffersComplete();
+}
+
+}  // namespace
+
+// PerViewManagerState ---------------------------------------------------------
+
+// State needed per ViewManager. Provides the real implementation of
+// CreateOutputSurface. SurfaceBinding obtains a pointer to the
+// PerViewManagerState appropriate for the ViewManager. PerViewManagerState is
+// stored in a thread local map. When no more refereces to a PerViewManagerState
+// remain the PerViewManagerState is deleted and the underlying map cleaned up.
+class SurfaceBinding::PerViewManagerState
+    : public base::RefCounted<PerViewManagerState>,
+      public mojo::ResourceReturner {
+ public:
+  static PerViewManagerState* Get(mojo::Shell* shell,
+                                  mojo::ViewManager* view_manager);
+
+  scoped_ptr<cc::OutputSurface> CreateOutputSurface(mojo::View* view);
+
+ private:
+  typedef std::map<mojo::ViewManager*,
+                   PerViewManagerState*> ViewManagerToStateMap;
+
+  friend class base::RefCounted<PerViewManagerState>;
+
+  PerViewManagerState(mojo::Shell* shell, mojo::ViewManager* view_manager);
+  ~PerViewManagerState() override;
+
+  void Init();
+
+  // mojo::ResourceReturner:
+  void ReturnResources(
+      mojo::Array<mojo::ReturnedResourcePtr> resources) override;
+
+  void SetIdNamespace(uint32_t id_namespace);
+
+  static base::LazyInstance<
+      base::ThreadLocalPointer<ViewManagerToStateMap>>::Leaky view_states;
+
+  mojo::Shell* shell_;
+  mojo::ViewManager* view_manager_;
+
+  // Set of state needed to create an OutputSurface.
+  mojo::GpuPtr gpu_;
+  mojo::SurfacePtr surface_;
+  mojo::Binding<mojo::ResourceReturner> returner_binding_;
+  uint32_t id_namespace_;
+  uint32_t next_local_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(PerViewManagerState);
+};
+
+// static
+base::LazyInstance<base::ThreadLocalPointer<
+    SurfaceBinding::PerViewManagerState::ViewManagerToStateMap>>::Leaky
+    SurfaceBinding::PerViewManagerState::view_states;
+
+// static
+SurfaceBinding::PerViewManagerState* SurfaceBinding::PerViewManagerState::Get(
+    mojo::Shell* shell,
+    mojo::ViewManager* view_manager) {
+  ViewManagerToStateMap* view_map = view_states.Pointer()->Get();
+  if (!view_map) {
+    view_map = new ViewManagerToStateMap;
+    view_states.Pointer()->Set(view_map);
+  }
+  if (!(*view_map)[view_manager]) {
+    (*view_map)[view_manager] = new PerViewManagerState(shell, view_manager);
+    (*view_map)[view_manager]->Init();
+  }
+  return (*view_map)[view_manager];
+}
+
+scoped_ptr<cc::OutputSurface>
+SurfaceBinding::PerViewManagerState::CreateOutputSurface(mojo::View* view) {
+  // TODO(sky): figure out lifetime here. Do I need to worry about the return
+  // value outliving this?
+  mojo::CommandBufferPtr cb;
+  gpu_->CreateOffscreenGLES2Context(GetProxy(&cb));
+  scoped_refptr<cc::ContextProvider> context_provider(
+      new mojo::ContextProviderMojo(cb.PassMessagePipe()));
+  return make_scoped_ptr(new OutputSurfaceImpl(
+      view, context_provider, surface_.get(), id_namespace_, &next_local_id_));
+}
+
+SurfaceBinding::PerViewManagerState::PerViewManagerState(
+    mojo::Shell* shell,
+    mojo::ViewManager* view_manager)
+    : shell_(shell),
+      view_manager_(view_manager),
+      returner_binding_(this),
+      id_namespace_(0u),
+      next_local_id_(0u) {
+}
+
+SurfaceBinding::PerViewManagerState::~PerViewManagerState() {
+  ViewManagerToStateMap* view_map = view_states.Pointer()->Get();
+  DCHECK(view_map);
+  DCHECK_EQ(this, (*view_map)[view_manager_]);
+  view_map->erase(view_manager_);
+  if (view_map->empty()) {
+    delete view_map;
+    view_states.Pointer()->Set(nullptr);
+  }
+}
+
+void SurfaceBinding::PerViewManagerState::Init() {
+  DCHECK(!surface_.get());
+
+  mojo::ServiceProviderPtr surfaces_service_provider;
+  shell_->ConnectToApplication("mojo:surfaces_service",
+                               GetProxy(&surfaces_service_provider),
+                               nullptr);
+  ConnectToService(surfaces_service_provider.get(), &surface_);
+  surface_->GetIdNamespace(
+      base::Bind(&SurfaceBinding::PerViewManagerState::SetIdNamespace,
+                 base::Unretained(this)));
+  // Block until we receive our id namespace.
+  surface_.WaitForIncomingMethodCall();
+  DCHECK_NE(0u, id_namespace_);
+
+  mojo::ResourceReturnerPtr returner_ptr;
+  returner_binding_.Bind(GetProxy(&returner_ptr));
+  surface_->SetResourceReturner(returner_ptr.Pass());
+
+  mojo::ServiceProviderPtr gpu_service_provider;
+  // TODO(jamesr): Should be mojo:gpu_service
+  shell_->ConnectToApplication("mojo:native_viewport_service",
+                               GetProxy(&gpu_service_provider),
+                               nullptr);
+  ConnectToService(gpu_service_provider.get(), &gpu_);
+}
+
+void SurfaceBinding::PerViewManagerState::SetIdNamespace(
+    uint32_t id_namespace) {
+  id_namespace_ = id_namespace;
+}
+
+void SurfaceBinding::PerViewManagerState::ReturnResources(
+    mojo::Array<mojo::ReturnedResourcePtr> resources) {
+}
+
+// SurfaceBinding --------------------------------------------------------------
+
+SurfaceBinding::SurfaceBinding(mojo::Shell* shell, mojo::View* view)
+    : view_(view),
+      state_(PerViewManagerState::Get(shell, view->view_manager())) {
+}
+
+SurfaceBinding::~SurfaceBinding() {
+}
+
+scoped_ptr<cc::OutputSurface> SurfaceBinding::CreateOutputSurface() {
+  return state_->CreateOutputSurface(view_);
+}
+
+}  // namespace mandoline