Add IPC to query capabilities of video input devices.

content/browser/renderer_host/media/media_devices_dispatcher_host.h

Index: content/browser/renderer_host/media/media_devices_dispatcher_host.h
diff --git a/content/browser/renderer_host/media/media_devices_dispatcher_host.h b/content/browser/renderer_host/media/media_devices_dispatcher_host.h
index 12ca0240e42cb3e73a7ee2ac4ccd8e612fee86a0..65c07dd85c05371ac42e859d25f6d79ead41015b 100644
--- a/content/browser/renderer_host/media/media_devices_dispatcher_host.h
+++ b/content/browser/renderer_host/media/media_devices_dispatcher_host.h
@@ -48,6 +48,9 @@ class CONTENT_EXPORT MediaDevicesDispatcherHost
       bool request_audio_output,
       const url::Origin& security_origin,
       const EnumerateDevicesCallback& client_callback) override;
+  void GetVideoInputCapabilities(
+      const url::Origin& security_origin,
+      const GetVideoInputCapabilitiesCallback& client_callback) override;
   void SubscribeDeviceChangeNotifications(
       MediaDeviceType type,
       uint32_t subscription_id,
@@ -79,6 +82,20 @@ class CONTENT_EXPORT MediaDevicesDispatcherHost
       const MediaDevicesManager::BoolDeviceTypes& has_permissions,
       const MediaDeviceEnumeration& enumeration);
 
+  void GotDefaultVideoInputDeviceID(
+      const url::Origin& security_origin,
+      const GetVideoInputCapabilitiesCallback& client_callback,
+      const std::string& default_device_id);
+
+  void FinalizeGetVideoInputCapabilities(
+      const url::Origin& security_origin,
+      const GetVideoInputCapabilitiesCallback& client_callback,
+      const std::string& default_device_id,
+      const MediaDeviceEnumeration& enumeration);
+
+  // Returns the currently supported video formats for the given |device_id|.
+  media::VideoCaptureFormats GetVideoInputFormats(const std::string& device_id);
+
   struct SubscriptionInfo;
   void NotifyDeviceChangeOnUIThread(
       const std::vector<SubscriptionInfo>& subscriptions,