Plumbing through more WebVR presentation code

device/vr/android/gvr/gvr_delegate.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 DEVICE_VR_ANDROID_GVR_DELEGATE_H
+#define DEVICE_VR_ANDROID_GVR_DELEGATE_H
+
+#include "device/vr/vr_export.h"
+
+#include "third_party/gvr-android-sdk/src/ndk-beta/include/vr/gvr/capi/include/gvr.h"
+
+namespace base {
+template <typename Type>
+struct DefaultSingletonTraits;
+}  // namespace base
+
+namespace device {
+
+class DEVICE_VR_EXPORT GvrDelegate {
+ public:
+  virtual void RequestWebVRPresent() = 0;
+  virtual void ExitWebVRPresent() = 0;
+
+  virtual void SubmitWebVRFrame() = 0;
+  virtual void UpdateWebVRTextureBounds(int eye,
+                                        float left,
+                                        float top,
+                                        float width,
+                                        float height) = 0;
+
+  virtual gvr::GvrApi* gvr_api() = 0;
+};
+
+class DEVICE_VR_EXPORT GvrDelegateClient {
+ public:
+  virtual void OnDelegateInitialized(GvrDelegate* delegate) = 0;
+  virtual void OnDelegateShutdown() = 0;
+};
+
+class DEVICE_VR_EXPORT GvrDelegateManager {
+ public:
+  static GvrDelegateManager* GetInstance();
+
+  void AddClient(GvrDelegateClient* client);
+  void RemoveClient(GvrDelegateClient* client);
+
+  void Initialize(GvrDelegate* delegate);
+  void Shutdown();
+
+  GvrDelegate* delegate() { return delegate_; }
+
+ private:
+  friend struct base::DefaultSingletonTraits<GvrDelegateManager>;
+
+  GvrDelegateManager();
+  ~GvrDelegateManager();
+
+  GvrDelegate* delegate_;
+
+  using ClientList = std::vector<GvrDelegateClient*>;
+  ClientList clients_;
+};
+
+}  // namespace device
+
+#endif  // DEVICE_VR_ANDROID_GVR_DELEGATE_H