Add AndroidVideoSurfaceChooser to manage overlays.

media/gpu/avda_overlay_helper_impl.h

+// 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.
+
+#ifndef MEDIA_GPU_AVDA_OVERLAY_HELPER_IMPL_H_
+#define MEDIA_GPU_AVDA_OVERLAY_HELPER_IMPL_H_
+
+#include "base/bind.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/android/android_overlay.h"
+#include "media/base/android/android_overlay_factory.h"
+#include "media/gpu/avda_overlay_helper.h"
+#include "media/gpu/media_gpu_export.h"
+
+namespace media {
+
+// Implementation of AVDAOverlayHelper.
+class MEDIA_GPU_EXPORT AVDAOverlayHelperImpl : public AVDAOverlayHelper {
+ public:
+  AVDAOverlayHelperImpl();
+  ~AVDAOverlayHelperImpl() override;
+
+  // AVDAOverlayHelper
+  void Startup(const UseOverlayCB& use_overlay_cb,
+               const UseSurfaceTextureCB& use_surface_texture_cb,
+               const StopUsingOverlayImmediatelyCB& stop_immediately_cb,
+               std::unique_ptr<AndroidOverlayFactory> initial_factory) override;
+  void OnOverlayFactory(
+      std::unique_ptr<AndroidOverlayFactory> factory) override;
+
+ private:
+  // AndroidOverlay callbacks.
+  void OnOverlayReady(AndroidOverlay*);
+  void OnOverlayFailed(AndroidOverlay*);
+  void OnSurfaceDestroyed(AndroidOverlay*);
+
+  // Client callbacks.
+  UseOverlayCB use_overlay_cb_;
+  UseSurfaceTextureCB use_surface_texture_cb_;
+  StopUsingOverlayImmediatelyCB stop_immediately_cb_;
+
+  // Current overlay that we've consructed but haven't received ready / failed
+  // callbacks yet.  Will be nullptr if we haven't constructed one, or if we
+  // sent it to the client already once it became ready to use.
+  std::unique_ptr<AndroidOverlay> overlay_;
+
+  // If true, we owe the client notification about whether to use an overlay
+  // or a surface texture.
+  bool client_notification_pending_ = false;
+
+  std::unique_ptr<AndroidOverlayFactory> overlay_factory_;
+
+  base::WeakPtrFactory<AVDAOverlayHelperImpl> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(AVDAOverlayHelperImpl);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_GPU_AVDA_OVERLAY_HELPER_IMPL_H_