Adding MediaStreamManager.

content/browser/renderer_host/media/media_stream_device_settings.cc

 // Copyright (c) 2011 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/media_stream_device_settings.h"
 
 #include "base/stl_util-inl.h"
 #include "base/task.h"
 #include "content/browser/browser_thread.h"
 #include "content/browser/renderer_host/media/media_stream_settings_requester.h"
@@ skipping 26 matching lines @@
 };
 
 MediaStreamDeviceSettings::MediaStreamDeviceSettings(
     SettingsRequester* requester)
     : requester_(requester) {
   DCHECK(requester_);
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 }
 
 MediaStreamDeviceSettings::~MediaStreamDeviceSettings() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   STLDeleteValues(&requests_);
 }
 
 void MediaStreamDeviceSettings::RequestCaptureDeviceUsage(

[wjia(left Chromium), 2011/07/01 03:58:34]

Is it good to combine RequestCaptureDeviceUsage with AvailableDevices? From the
code, it looks that the same requester will provide device list later. Combining
those 2 function can simplify the interface between requester and
DeviceSettings, and save a round trip between them (GetDevice and
AvailableDevices).

[mflodman1, 2011/07/01 09:37:10]

This is a good point and I was thinking about this too. I made it this way since
I don't know exactly what the UI guys need and how they would like to use this.
This allows them to call GetDevices to populate a UI without getting a device
request, which is useful in case of having a settings page rather than a pop-up
only when starting a camera.

     const std::string& label, int render_process_id, int render_view_id,
     const StreamOptions& request_options, const std::string& security_origin) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   if (requests_.find(label) != requests_.end()) {
     // Request with this id already exists.
     requester_->Error(label);
     return;
   }
 
@@ skipping 58 matching lines @@
       }
     }
     // Post result and delete request.
     requester_->DevicesAccepted(label, devices_to_use);
     requests_.erase(request_it);
     delete request;
   }
 }
 
 }  // namespace media_stream