[Experimental] Supporting OOPIF printing

services/pdf_compositor/pdf_compositor_service.cc

+// Copyright 2017 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/pdf_compositor/pdf_compositor_service.h"
+
+#include "base/macros.h"
+#include "base/memory/discardable_memory.h"
+#include "base/memory/ptr_util.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "base/time/time.h"
+#include "base/trace_event/memory_allocator_dump.h"
+#include "content/public/child/child_thread.h"
+#include "content/public/common/service_names.mojom.h"
+#include "mojo/edk/embedder/embedder.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "services/pdf_compositor/pdf_compositor_impl.h"
+#include "services/pdf_compositor/public/interfaces/constants.mojom.h"
+#include "services/pdf_compositor/public/interfaces/pdf_compositor.mojom.h"
+#include "services/service_manager/public/cpp/interface_registry.h"
+#include "services/service_manager/public/cpp/service_context.h"
+#include "third_party/WebKit/public/platform/WebImageGenerator.h"
+#include "third_party/skia/include/core/SkGraphics.h"
+
+namespace pdf_compositor {
+
+PdfCompositorService::PdfCompositorService() : weak_factory_(this) {}
+
+PdfCompositorService::~PdfCompositorService() = default;
+
+// static
+std::unique_ptr<service_manager::Service> PdfCompositorService::Create() {
+  return base::MakeUnique<PdfCompositorService>();
+}
+
+void PdfCompositorService::OnStart() {
+  // Hook up blink's codecs so skia can call them
+  SkGraphics::SetImageGeneratorFromEncodedFactory(
+      blink::WebImageGenerator::create);
+
+  // Set up discardable memory manager.
+  discardable_memory::mojom::DiscardableSharedMemoryManagerPtr manager_ptr;
+  content::ChildThread::Get()->GetRemoteInterfaces()->GetInterface(
+      mojo::MakeRequest(&manager_ptr));
+  io_thread_ = base::MakeUnique<base::Thread>("IOThread");
+  base::Thread::Options thread_options(base::MessageLoop::TYPE_IO, 0);
+  thread_options.priority = base::ThreadPriority::NORMAL;
+  io_thread_->StartWithOptions(thread_options);
+  discardable_shared_memory_manager_ = base::MakeUnique<
+      discardable_memory::ClientDiscardableSharedMemoryManager>(
+      std::move(manager_ptr), io_thread_->task_runner());
+  DCHECK(discardable_shared_memory_manager_);
+  base::DiscardableMemoryAllocator::SetInstance(
+      discardable_shared_memory_manager_.get());
+
+  ref_factory_.reset(new service_manager::ServiceContextRefFactory(base::Bind(
+      &PdfCompositorService::MaybeRequestQuitDelayed, base::Unretained(this))));
+}
+
+bool PdfCompositorService::OnConnect(
+    const service_manager::ServiceInfo& remote_info,
+    service_manager::InterfaceRegistry* registry) {
+  registry->AddInterface<mojom::PdfCompositor>(this);
+  return true;
+}
+
+bool PdfCompositorService::OnStop() {
+  return true;
+}
+
+void PdfCompositorService::Create(
+    const service_manager::Identity& remote_identity,
+    mojom::PdfCompositorRequest request) {
+  mojo::MakeStrongBinding(
+      base::MakeUnique<PdfCompositorImpl>(ref_factory_->CreateRef()),
+      std::move(request));
+}
+
+void PdfCompositorService::MaybeRequestQuitDelayed() {
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+      FROM_HERE, base::Bind(&PdfCompositorService::MaybeRequestQuit,
+                            weak_factory_.GetWeakPtr()),
+      base::TimeDelta::FromSeconds(5));
+}
+
+void PdfCompositorService::MaybeRequestQuit() {
+  DCHECK(ref_factory_);
+  if (ref_factory_->HasNoRefs())
+    context()->RequestQuit();
+}
+
+}  // namespace pdf_compositor