Desktop chrome tab capture-chooseDesktopMedia()

chrome/browser/media/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_DESKTOP_MEDIA_LIST_H_
 #define CHROME_BROWSER_MEDIA_DESKTOP_MEDIA_LIST_H_
 
+#include "base/id_map.h"
+#include "base/memory/singleton.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "content/public/browser/desktop_media_id.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "ui/gfx/image/image.h"
 #include "ui/gfx/image/image_skia.h"
 
 class DesktopMediaListObserver;
 
 // DesktopMediaList provides the list of desktop media source (screens, windows,
 // tabs), and their thumbnails, to the desktop media picker dialog. It
 // transparently updates the list in the background, and notifies the desktop
 // media picker when something changes.
 class DesktopMediaList {
  public:
@@ skipping 29 matching lines @@
   // notifications will be generated for each existing source as it is
   // enumerated. After the initial enumeration the model will be refreshed based
   // on the update period, and notifications generated only for changes in the
   // model.
   virtual void StartUpdating(DesktopMediaListObserver* observer) = 0;
 
   virtual int GetSourceCount() const = 0;
   virtual const Source& GetSource(int index) const = 0;
 };
 
+// Create a image with an enlarged favicon on its center and black boundary.
+// If fails, an empty image will return.
+// The function is used to create a thumbnail for chrome tab preview.
+gfx::ImageSkia CreateEnlargedFaviconImage(gfx::Size size, gfx::Image& favicon);
+
+// Register WebContents.
+class WebContentsRegistry : public content::WebContentsObserver {
+ public:
+  static WebContentsRegistry* GetInstance();
+
+  // Return an id to represent the WebContents.
+  int RegisterWebContents(content::WebContents* web_contents);
+  // Get a registed WebContents by id. If the Webcontent is destroyed, a nullptr
+  // will be return.
+  content::WebContents* GetWebContentsById(int id);
+
+ private:
+  friend struct base::DefaultSingletonTraits<WebContentsRegistry>;
+  WebContentsRegistry();
+  ~WebContentsRegistry() override;
+
+  // content::WebContentsObserver overrides.
+  void WebContentsDestroyed(content::WebContents* web_contents) override;
+
+  IDMap<content::WebContents> registered_web_contents_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentsRegistry);
+};
+
 #endif  // CHROME_BROWSER_MEDIA_DESKTOP_MEDIA_LIST_H_