Move ChromeOS login media access logic into a MediaAccessHandler

chrome/browser/media/media_access_handler.h

Index: chrome/browser/media/media_access_handler.h
diff --git a/chrome/browser/media/media_access_handler.h b/chrome/browser/media/media_access_handler.h
index bc7b8556380abbca69baa61a9b6ccb60b423bb22..82dc719502e2b419cf25a348fbb0f4135b5fb7cb 100644
--- a/chrome/browser/media/media_access_handler.h
+++ b/chrome/browser/media/media_access_handler.h
@@ -25,7 +25,8 @@ class MediaAccessHandler {
   virtual ~MediaAccessHandler() {}
 
   // Check if the media stream type is supported by MediaAccessHandler.
-  virtual bool SupportsStreamType(const content::MediaStreamType type,
+  virtual bool SupportsStreamType(content::WebContents* web_contents,
+                                  const content::MediaStreamType type,
                                   const extensions::Extension* extension) = 0;
   // Check media access permission. |extension| is set to NULL if request was
   // made from a drive-by page.
@@ -46,6 +47,17 @@ class MediaAccessHandler {
                                        int page_request_id,
                                        content::MediaStreamType stream_type,
                                        content::MediaRequestState state) {}
+
+ protected:
+  // Helper function for derived classes which takes in whether audio/video
+  // permissions are allowed and queries for the requested devices, running the
+  // callback with the appropriate device list and status.
+  static void CheckDevicesAndRunCallback(
+      content::WebContents* web_contents,
+      const content::MediaStreamRequest& request,
+      const content::MediaResponseCallback& callback,
+      bool audio_allowed,
+      bool video_allowed);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_ACCESS_HANDLER_H_