[Mojo Video Capture] Hook up video capture service behind a feature flag

content/browser/renderer_host/media/video_capture_provider_switcher.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 CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_PROVIDER_SWITCHER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_PROVIDER_SWITCHER_H_
+
+#include "content/browser/renderer_host/media/video_capture_provider.h"
+#include "services/video_capture/public/interfaces/device_factory.mojom.h"
+
+namespace content {
+
+// Routes requests for media devices, e.g. cameras, to
+// |media_device_capture_provider| and for all other types of capture, e.g.
+// screen or tab capture, to the given |other_types_capture_provider|.
+class CONTENT_EXPORT VideoCaptureProviderSwitcher
+    : public VideoCaptureProvider {
+ public:
+  VideoCaptureProviderSwitcher(
+      std::unique_ptr<VideoCaptureProvider> media_device_capture_provider,
+      std::unique_ptr<VideoCaptureProvider> other_types_capture_provider);
+  ~VideoCaptureProviderSwitcher() override;
+
+  void Uninitialize() override;
+
+  void GetDeviceInfosAsync(
+      const base::Callback<void(
+          const std::vector<media::VideoCaptureDeviceInfo>&)>& result_callback)

[piman, 2017/05/15 19:34:32]

nit: should this callback type be a typedef in VideoCaptureProvider?

[chfremer, 2017/05/15 22:08:13]

Done.

+      override;
+
+  std::unique_ptr<VideoCaptureDeviceLauncher> CreateDeviceLauncher() override;
+
+ private:
+  const std::unique_ptr<VideoCaptureProvider> media_device_capture_provider_;
+  const std::unique_ptr<VideoCaptureProvider> other_types_capture_provider_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_PROVIDER_SWITCHER_H_