This patch implements a device selection UI to chrome content setting, and the UI will be similar to that device UI in gmail-chat settings.

In order to achieve it, this patch:
# added a MediaDevicesSelectionHandler in UI options to handle the device selection.
# added a MediaCaptureDevicesDispatcher to chrome media, which will receive device changed notification from MediaStreamManager when a capture device is plugged in or unplugged, then it will cached the device lists and send the new lists to its observers.
# MediaDevicesSelectionHandler will register itself as the observer to MediaCaptureDevicesDispatcher when it is initialized, so that it will always get up-to-date device lists. And it will remove itself on destruction.

BUG=159398
TEST= go to content setting media section, select devices via the menus.

Review URL: https://codereview.chromium.org/11364048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@168227 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 20 insertions, 1 deletions

diff --git a/chrome/browser/media/media_internals.cc b/chrome/browser/media/media_internals.cc
index 8584ae4..c57fb48 100644
--- a/chrome/browser/media/media_internals.cc
+++ b/chrome/browser/media/media_internals.cc
@@ -7,6 +7,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/stringprintf.h"
+#include "chrome/browser/media/media_capture_devices_dispatcher.h"
 #include "chrome/browser/media/media_internals_observer.h"
 #include "chrome/browser/media/media_stream_capture_indicator.h"
 #include "content/public/browser/browser_thread.h"
@@ -84,6 +85,18 @@ void MediaInternals::OnCaptureDevicesClosed(
                                                         devices);
 }
 
+void MediaInternals::OnAudioCaptureDevicesChanged(
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  media_devices_dispatcher_->AudioCaptureDevicesChanged(devices);
+}
+
+void MediaInternals::OnVideoCaptureDevicesChanged(
+    const content::MediaStreamDevices& devices) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  media_devices_dispatcher_->VideoCaptureDevicesChanged(devices);
+}
+
 void MediaInternals::OnMediaRequestStateChanged(
     int render_process_id,
     int render_view_id,
@@ -111,13 +124,19 @@ void MediaInternals::SendEverything() {
   SendUpdate("media.onReceiveEverything", &data_);
 }
 
+scoped_refptr<MediaCaptureDevicesDispatcher>
+MediaInternals::GetMediaCaptureDevicesDispatcher() {
+  return media_devices_dispatcher_;
+}
+
 scoped_refptr<MediaStreamCaptureIndicator>
 MediaInternals::GetMediaStreamCaptureIndicator() {
   return media_stream_capture_indicator_.get();
 }
 
 MediaInternals::MediaInternals()
-    : media_stream_capture_indicator_(new MediaStreamCaptureIndicator()) {
+    : media_stream_capture_indicator_(new MediaStreamCaptureIndicator()),
+      media_devices_dispatcher_(new MediaCaptureDevicesDispatcher()) {
 }
 
 void MediaInternals::UpdateAudioStream(