DesktopCaptureDevice is available when webrtc is enabled.

content/browser/renderer_host/media/video_capture_manager.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/renderer_host/media/video_capture_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
@@ skipping 22 matching lines @@
 #include "content/public/browser/desktop_media_id.h"
 #include "content/public/common/media_stream_request.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/media_switches.h"
 #include "media/capture/video/video_capture_buffer_pool_impl.h"
 #include "media/capture/video/video_capture_buffer_tracker_factory_impl.h"
 #include "media/capture/video/video_capture_device.h"
 #include "media/capture/video/video_capture_device_client.h"
 #include "media/capture/video/video_capture_device_factory.h"
 
-#if defined(ENABLE_SCREEN_CAPTURE) && !defined(OS_ANDROID)
+#if BUILDFLAG(ENABLE_WEBRTC) && !defined(OS_ANDROID)

[miu, 2017/01/10 23:27:49]

Both (per prior e-mail on this CR):

  #if defined(ENABLE_SCREEN_CAPTURE) && BUILDFLAG(ENABLE_WEBRTC) &&
!defined(OS_ANDROID)

But, let's consolidate all of lines 43-53 as:

#if defined(ENABLE_SCREEN_CAPTURE)

#if BUILDFLAG(ENABLE_WEBRTC) && !defined(OS_ANDROID)
#include "content/browser/media/capture/desktop_capture_device.h"
#endif

#if defined(USE_AURA)
#include "content/browser/media/capture/desktop_capture_device_aura.h"
#endif

#if defined(OS_ANDROID)
#include "content/browser/media/capture/screen_capture_device_android.h"
#endif

#endif  // defined(ENABLE_SCREEN_CAPTURE)

[byungchul, 2017/01/10 23:48:33]

Done.

 #include "content/browser/media/capture/desktop_capture_device.h"
-#if defined(USE_AURA)
+#endif
+
+#if defined(ENABLE_SCREEN_CAPTURE) && !defined(OS_ANDROID) && defined(USE_AURA)

[miu, 2017/01/10 23:27:50]

!defined(OS_ANDROID) is not needed (since AURA is not built on Android).

 #include "content/browser/media/capture/desktop_capture_device_aura.h"
 #endif
-#endif
 
 #if defined(ENABLE_SCREEN_CAPTURE) && defined(OS_ANDROID)
 #include "content/browser/media/capture/screen_capture_device_android.h"
 #endif
 
 namespace {
 
 class VideoFrameConsumerFeedbackObserverOnTaskRunner
     : public media::VideoFrameConsumerFeedbackObserver {
  public:
@@ skipping 617 matching lines @@
 
 std::unique_ptr<media::VideoCaptureDevice>
 VideoCaptureManager::DoStartDesktopCaptureOnDeviceThread(
     const std::string& id,
     const media::VideoCaptureParams& params,
     std::unique_ptr<VideoCaptureDevice::Client> device_client) {
   SCOPED_UMA_HISTOGRAM_TIMER("Media.VideoCaptureManager.StartDeviceTime");
   DCHECK(IsOnDeviceThread());
 
   std::unique_ptr<VideoCaptureDevice> video_capture_device;
-#if defined(ENABLE_SCREEN_CAPTURE)
   DesktopMediaID desktop_id = DesktopMediaID::Parse(id);
   if (desktop_id.is_null()) {
     device_client->OnError(FROM_HERE, "Desktop media ID is null");
     return nullptr;
   }
 
+#if defined(ENABLE_SCREEN_CAPTURE)

[miu, 2017/01/10 23:27:49]

Let's move this back up to where it was, given previous comments (and prior
e-mails).

[byungchul, 2017/01/10 23:48:33]

Done.

   if (desktop_id.type == DesktopMediaID::TYPE_WEB_CONTENTS) {
 #if defined(OS_LINUX) || defined(OS_MACOSX) || defined(OS_WIN)
     video_capture_device = WebContentsVideoCaptureDevice::Create(id);
     IncrementDesktopCaptureCounter(TAB_VIDEO_CAPTURER_CREATED);
     if (desktop_id.audio_share) {
       IncrementDesktopCaptureCounter(TAB_VIDEO_CAPTURER_CREATED_WITH_AUDIO);
     } else {
       IncrementDesktopCaptureCounter(TAB_VIDEO_CAPTURER_CREATED_WITHOUT_AUDIO);
     }
 #endif
   } else {
 #if defined(OS_ANDROID)
     video_capture_device = base::MakeUnique<ScreenCaptureDeviceAndroid>();
 #else
 #if defined(USE_AURA)
     video_capture_device = DesktopCaptureDeviceAura::Create(desktop_id);
 #endif  // defined(USE_AURA)
-    if (!video_capture_device)
-      video_capture_device = DesktopCaptureDevice::Create(desktop_id);
 #endif  // defined (OS_ANDROID)
   }
 #endif  // defined(ENABLE_SCREEN_CAPTURE)
 
+#if BUILDFLAG(ENABLE_WEBRTC) && !defined(OS_ANDROID)

[miu, 2017/01/10 23:27:49]

...and move this up so that it is within the ENABLE_SCREEN_CAPTURE block.

[byungchul, 2017/01/10 23:48:33]

Done.

+  if (!video_capture_device)
+    video_capture_device = DesktopCaptureDevice::Create(desktop_id);
+#endif  // BUILDFLAG(ENABLE_WEBRTC)
+
   if (!video_capture_device) {
     device_client->OnError(FROM_HERE, "Could not create capture device");
     return nullptr;
   }
 
   video_capture_device->AllocateAndStart(params, std::move(device_client));
   return video_capture_device;
 }
 
 void VideoCaptureManager::StartCaptureForClient(
@@ skipping 494 matching lines @@
 
   devices_.emplace_back(
       new DeviceEntry(device_info.type, device_info.id, params));
   return devices_.back().get();
 }
 
 void VideoCaptureManager::SetDesktopCaptureWindowIdOnDeviceThread(
     media::VideoCaptureDevice* device,
     gfx::NativeViewId window_id) {
   DCHECK(IsOnDeviceThread());
-#if defined(ENABLE_SCREEN_CAPTURE) && !defined(OS_ANDROID)
+#if BUILDFLAG(ENABLE_WEBRTC) && !defined(OS_ANDROID)
   DesktopCaptureDevice* desktop_device =
       static_cast<DesktopCaptureDevice*>(device);
   desktop_device->SetNotificationWindowId(window_id);
   VLOG(2) << "Screen capture notification window passed on device thread.";
 #endif
 }
 
 void VideoCaptureManager::DoGetPhotoCapabilities(
     VideoCaptureDevice::GetPhotoCapabilitiesCallback callback,
     VideoCaptureDevice* device) {
@@ skipping 80 matching lines @@
     if (!device_in_queue) {
       // Session ID is only valid for Screen capture. So we can fake it to
       // resume video capture devices here.
       QueueStartDevice(kFakeSessionId, entry.get(), entry->parameters);
     }
   }
 }
 #endif  // defined(OS_ANDROID)
 
 }  // namespace content