Add support for a virtual display on ChromeOS

chrome/browser/media/desktop_media_list_ash.cc

 // Copyright 2013 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 "chrome/browser/media/desktop_media_list_ash.h"
 
 #include <set>
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "base/hash.h"
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/sys_info.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/media/desktop_media_list_observer.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_thread.h"
 #include "media/base/video_util.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/compositor/dip_util.h"
+#include "ui/display/chromeos/display_configurator.h"
 #include "ui/gfx/image/image.h"
 #include "ui/snapshot/snapshot.h"
 
 using content::BrowserThread;
 using content::DesktopMediaID;
 
 namespace {
 
 // Update the list twice per second.
 const int kDefaultUpdatePeriod = 500;
@@ skipping 171 matching lines @@
 
     if (source_types_ & WINDOWS) {
       EnumerateWindowsForRoot(
           sources, root_windows[i], ash::kShellWindowId_DefaultContainer);
       EnumerateWindowsForRoot(
           sources, root_windows[i], ash::kShellWindowId_AlwaysOnTopContainer);
       EnumerateWindowsForRoot(
           sources, root_windows[i], ash::kShellWindowId_DockedContainer);
     }
   }
+#if defined(OS_CHROMEOS)
+  // DisplayConfigurator only works when running on ChromeOS

[achuithb, 2015/02/11 23:41:43]

nit: period at end of comment

+  if (base::SysInfo::IsRunningOnChromeOS()) {
+    ui::DisplayConfigurator* configurator =
+        ash::Shell::GetInstance()->display_configurator();
+    if (configurator->GetVirtualDisplayId() ==
+        gfx::Display::kInvalidDisplayID) {
+      SourceDescription virtual_screen_source(
+          content::DesktopMediaID(
+              content::DesktopMediaID::TYPE_AURA_VIRTUAL_SCREEN, 0),
+          l10n_util::GetStringUTF16(
+              IDS_DESTOP_MEDIA_PICKER_VIRTUAL_SCREEN_NAME));
+      sources->push_back(virtual_screen_source);
+      // TODO: There is no thumbnail for the virtual screen right now

[achuithb, 2015/02/11 23:41:43]

period at the end. Add your name in the TODO(<name>), add a bug-id.

+    }
+  }
+#endif
 }
 
 void DesktopMediaListAsh::CaptureThumbnail(content::DesktopMediaID id,
                                            aura::Window* window) {
   gfx::Rect window_rect(window->bounds().width(), window->bounds().height());
   gfx::Rect scaled_rect = media::ComputeLetterboxRegion(
       gfx::Rect(thumbnail_size_), window_rect.size());
 
   ++pending_window_capture_requests_;
   ui::GrabWindowSnapshotAndScaleAsync(
@@ skipping 22 matching lines @@
   if (!pending_window_capture_requests_) {
     // Once we've finished capturing all windows post a task for the next list
     // update.
     BrowserThread::PostDelayedTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&DesktopMediaListAsh::Refresh,
                    weak_factory_.GetWeakPtr()),
         update_period_);
   }
 }