content: Add ContextProviderFactory to create a render ContextProvider.

content/public/browser/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 CONTENT_PUBLIC_BROWSER_ANDROID_CONTEXT_PROVIDER_FACTORY_H_
+#define CONTENT_PUBLIC_BROWSER_ANDROID_CONTEXT_PROVIDER_FACTORY_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+
+namespace cc {
+class ContextProvider;
+class VulkanContextProvider;
+}
+
+namespace content {
+
+// This class is not thread-safe and should only be accessed from the UI thread.
+class CONTENT_EXPORT ContextProviderFactory {
+ public:
+  struct ContextProviders {
+    ContextProviders();
+    ~ContextProviders();
+
+    scoped_refptr<cc::VulkanContextProvider> vulkan_context_provider;
+
+    scoped_refptr<cc::ContextProvider> compositor_context_provider;
+    scoped_refptr<cc::ContextProvider> worker_context_provider;
+  };
+
+  using ContextProviderCallback = base::Callback<void(const ContextProviders&)>;
+
+  static ContextProviderFactory* GetInstance();
+
+  virtual ~ContextProviderFactory(){};
+
+  // Creates a ContextProvider with an offscreen context for a compositor
+  // rendering web content.
+  virtual void RequestRenderContextProvider(
+      ContextProviderCallback result_callback) = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_CONTEXT_PROVIDER_FACTORY_H_