[Mojo Video Capture] Create abstraction VideoCaptureProvider

content/browser/renderer_host/media/video_capture_provider.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_BUILDABLE_VIDEO_CAPTURE_DEVICE_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_BUILDABLE_VIDEO_CAPTURE_DEVICE_H_
 
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted.h"
 #include "content/public/common/media_stream_request.h"
 #include "media/capture/video/video_capture_device.h"
+#include "media/capture/video/video_capture_device_info.h"
 #include "media/capture/video_capture_types.h"
 
 namespace content {
 
 class VideoCaptureController;
 
 // Abstraction for a video capture device that must be "built" before it can be
 // operated and must be "stopped", before it can be released. Typical operation
 // is that a newly created instance initially reports IsDeviceAlive() == false.
 // Clients call CreateAndStartDeviceAsync(), which kicks off the asynchronous
@@ skipping 36 matching lines @@
       media::VideoCaptureDevice::TakePhotoCallback callback) = 0;
   virtual void MaybeSuspendDevice() = 0;
   virtual void ResumeDevice() = 0;
   virtual void RequestRefreshFrame() = 0;
 
   // Methods for specific types of devices.
   virtual void SetDesktopCaptureWindowIdAsync(gfx::NativeViewId window_id,
                                               base::OnceClosure done_cb) = 0;
 };
 
+class CONTENT_EXPORT VideoCaptureProvider {
+ public:
+  virtual ~VideoCaptureProvider() {}
+
+  // The passed-in |result_callback| must guarantee that the called
+  // instance stays alive until |result_callback| is invoked.
+  virtual void GetDeviceInfosAsync(
+      const base::Callback<
+          void(const std::vector<media::VideoCaptureDeviceInfo>&)>&
+          result_callback) = 0;
+
+  virtual std::unique_ptr<BuildableVideoCaptureDevice> CreateBuildableDevice(
+      const std::string& device_id,
+      MediaStreamType stream_type) = 0;
+};
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_BUILDABLE_VIDEO_CAPTURE_DEVICE_H_