content: Add ContextProviderFactory to create a render ContextProvider.

ui/android/context_provider_factory.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 UI_ANDROID_CONTEXT_PROVIDER_FACTORY_H_
+#define UI_ANDROID_CONTEXT_PROVIDER_FACTORY_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "ui/android/ui_android_export.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace cc {
+class ContextProvider;
+class GpuMemoryBufferManager;
+class VulkanContextProvider;
+class SharedBitmapManager;
+class SurfaceManager;
+}
+
+namespace gpu {
+namespace gles2 {
+struct ContextCreationAttribHelper;
+}  // namespace gles
+
+struct SharedMemoryLimits;
+class GpuMemoryBufferManager;
+}  // namespace gpu
+
+namespace ui {
+
+// This class is not thread-safe and should only be accessed from the UI thread.
+class UI_ANDROID_EXPORT ContextProviderFactory {
+ public:
+  using ContextProviderCallback =
+      base::Callback<void(const scoped_refptr<cc::ContextProvider>&)>;
+
+  static ContextProviderFactory* GetInstance();
+
+  // This should only be called once, on startup. Ownership remains with the
+  // caller.
+  static void SetInstance(ContextProviderFactory* context_provider_factory);
+
+  virtual ~ContextProviderFactory(){};
+
+  virtual scoped_refptr<cc::VulkanContextProvider>
+  GetSharedVulkanContextProvider() = 0;
+
+  // Creates an offscreen ContextProvider for the compositor. Any shared
+  // contexts passed here *must* have been created using this factory.
+  virtual void CreateOffscreenContextProvider(
+      gpu::SharedMemoryLimits shared_memory_limits,
+      gpu::gles2::ContextCreationAttribHelper attributes,
+      bool support_locking,
+      bool automatic_flushes,
+      cc::ContextProvider* shared_context_provider,
+      ContextProviderCallback result_callback) = 0;
+
+  virtual cc::SurfaceManager* GetSurfaceManager() = 0;
+
+  virtual uint32_t AllocateSurfaceClientId() = 0;
+
+  virtual cc::SharedBitmapManager* GetSharedBitmapManager() = 0;
+
+  virtual gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
+};
+
+}  // namespace ui
+
+#endif  // UI_ANDROID_CONTEXT_PROVIDER_FACTORY_H_