content: Add ContextProviderFactory to create a render ContextProvider.

content/browser/renderer_host/context_provider_factory_impl_android.h

+// Copyright 2016 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_CONTEXT_PROVIDER_FACTORY_IMPL_ANDROID_H_
+#define CONTENT_BROWSER_RENDERER_HOST_CONTEXT_PROVIDER_FACTORY_IMPL_ANDROID_H_
+
+#include <list>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "base/timer/timer.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/android/context_provider_factory.h"
+
+namespace base {
+template <typename T>
+struct DefaultSingletonTraits;
+}
+
+namespace cc {
+class VulkanInProcessContextProvider;
+}
+
+namespace gpu {
+class GpuChannelHost;
+}
+
+namespace content {
+class ContextProviderCommandBuffer;
+
+class CONTENT_EXPORT ContextProviderFactoryImpl
+    : public ContextProviderFactory {
+ public:
+  using GpuChannelRequestCallback =
+      base::Callback<void(scoped_refptr<gpu::GpuChannelHost>)>;
+
+  static ContextProviderFactoryImpl* GetInstance();
+
+  ~ContextProviderFactoryImpl() override;
+
+  void RequestRenderContextProvider(
+      ContextProviderCallback result_callback) override;
+
+  void RequestGpuChannel(
+      GpuChannelRequestCallback gpu_channel_request_callback);
+
+  scoped_refptr<cc::VulkanInProcessContextProvider>
+  GetSharedVulkanContextProviderAndroid();
+
+ private:
+  friend struct base::DefaultSingletonTraits<ContextProviderFactoryImpl>;
+
+  ContextProviderFactoryImpl();
+
+  // Will return nullptr if the Gpu channel has not been established.
+  gpu::GpuChannelHost* EnsureGpuChannelEstablished();
+  void OnGpuChannelEstablished();
+  void OnGpuChannelTimeout();
+
+  void HandlePendingRequests();
+
+  void CreateRenderCompositorContexts(
+      ContextProviders& context_providers,
+      scoped_refptr<gpu::GpuChannelHost> gpu_channel_host);
+
+  scoped_refptr<ContextProviderCommandBuffer>
+  SharedCompositorWorkerContextProvider(
+      scoped_refptr<gpu::GpuChannelHost> gpu_channel_host);
+
+  GpuChannelRequestCallback gpu_channel_request_callback_;
+  std::list<ContextProviderCallback> render_context_request_callbacks_;
+
+  scoped_refptr<ContextProviderCommandBuffer> shared_worker_context_provider_;
+
+  bool in_handle_pending_requests_;
+
+  base::OneShotTimer establish_gpu_channel_timeout_;
+
+  base::WeakPtrFactory<ContextProviderFactoryImpl> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContextProviderFactoryImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_CONTEXT_PROVIDER_FACTORY_IMPL_ANDROID_H_