Add AshDesktopMediaList and enable Desktop Capture API on Chrome OS.

chrome/browser/media/ash_desktop_media_list.h

+// 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.
+
+#ifndef CHROME_BROWSER_MEDIA_ASH_DESKTOP_MEDIA_LIST_H_
+#define CHROME_BROWSER_MEDIA_ASH_DESKTOP_MEDIA_LIST_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/sequenced_task_runner.h"
+#include "chrome/browser/media/desktop_media_list.h"
+#include "content/public/browser/desktop_media_id.h"
+#include "ui/gfx/image/image_skia.h"
+
+class SkBitmap;
+
+namespace aura {
+class Window;
+}
+
+namespace cc {
+class CopyOutputResult;
+class SingleReleaseCallback;
+}
+
+// Implementation of DesktopMediaList that shows native screens and
+// native windows.
+class AshDesktopMediaList : public DesktopMediaList {
+ public:
+  enum SourceTypes {
+    SCREENS = 1,
+    WINDOWS = 2,
+  };
+
+  explicit AshDesktopMediaList(int source_types);
+  virtual ~AshDesktopMediaList();
+
+  // DesktopMediaList interface.
+  virtual void SetUpdatePeriod(base::TimeDelta period) OVERRIDE;
+  virtual void SetThumbnailSize(const gfx::Size& thumbnail_size) OVERRIDE;
+  virtual void StartUpdating(DesktopMediaListObserver* observer) OVERRIDE;
+  virtual int GetSourceCount() const OVERRIDE;
+  virtual const Source& GetSource(int index) const OVERRIDE;
+  virtual void SetViewDialogWindowId(
+      content::DesktopMediaID::Id dialog_id) OVERRIDE;
+
+ private:
+  // Struct used to represent sources list the model gets from the Worker.
+  struct SourceDescription {
+    SourceDescription(content::DesktopMediaID id, const string16& name);
+
+    content::DesktopMediaID id;
+    string16 name;
+  };
+
+  // Order comparator for sources. Used to sort list of sources.
+  static bool CompareSources(const SourceDescription& a,
+                             const SourceDescription& b);
+
+  void Refresh();
+  void EnumerateWindowsForRoot(
+      std::vector<AshDesktopMediaList::SourceDescription>* windows,
+      aura::Window* root_window,
+      int container_id);
+  void EnumerateSources(
+      std::vector<AshDesktopMediaList::SourceDescription>* windows);
+  void CaptureThumbnail(content::DesktopMediaID id, aura::Window* window);
+  void OnThumbnailCaptured(content::DesktopMediaID id,
+                           scoped_ptr<cc::CopyOutputResult> result);
+  void OnFrameScalingFinished(content::DesktopMediaID id,
+                              scoped_ptr<SkBitmap> captured_bitmap,
+                              scoped_ptr<SkBitmap> scaled_bitmap);
+  void OnFrameCaptureFinished();
+
+  int source_types_;
+
+  // Time interval between mode updates.
+  base::TimeDelta update_period_;
+
+  // Size of thumbnails generated by the model.
+  gfx::Size thumbnail_size_;
+
+  // ID of the hosting dialog.
+  content::DesktopMediaID::Id view_dialog_id_;
+
+  // The observer passed to StartUpdating().
+  DesktopMediaListObserver* observer_;
+
+  // Current list of sources.
+  std::vector<Source> sources_;
+
+  int pending_window_capture_requests_;
+
+  base::WeakPtrFactory<AshDesktopMediaList> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(AshDesktopMediaList);
+};
+
+#endif  // CHROME_BROWSER_MEDIA_ASH_DESKTOP_MEDIA_LIST_H_