Add the picture element

Source/core/html/HTMLPictureElement.idl

Index: Source/core/html/HTMLPictureElement.idl
diff --git a/Source/modules/battery/NavigatorBattery.idl b/Source/core/html/HTMLPictureElement.idl
similarity index 60%
copy from Source/modules/battery/NavigatorBattery.idl
copy to Source/core/html/HTMLPictureElement.idl
index 524bf238c12fc3d0cae9056d4e0dd9df8ce44c81..649316cb8a1be19e29c17f14bfbc5b6e10397164 100644
--- a/Source/modules/battery/NavigatorBattery.idl
+++ b/Source/core/html/HTMLPictureElement.idl
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// http://picture.responsiveimages.org
 [
-    RuntimeEnabled=BatteryStatus,
-] partial interface Navigator {
-    readonly attribute BatteryManager battery;
+    RuntimeEnabled=Picture
+] interface HTMLPictureElement : HTMLElement {
 };