[screen-orientation] Update implementation to match recent spec changes.

Source/modules/screen_orientation/ScreenOrientation.idl

Index: Source/modules/screen_orientation/ScreenOrientation.idl
diff --git a/Source/modules/screen_orientation/ScreenOrientation.idl b/Source/modules/screen_orientation/ScreenOrientation.idl
index f869dc547f380072cd5ab3d132e823b58d0367ab..057ad37c57456f156759e2b2ef6064941351d3be 100644
--- a/Source/modules/screen_orientation/ScreenOrientation.idl
+++ b/Source/modules/screen_orientation/ScreenOrientation.idl
@@ -2,18 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-enum OrientationType {
+enum OrientationLockType {
+    "any",
+    "natural",
+    "landscape",
+    "portrait",
     "portrait-primary",
     "portrait-secondary",
     "landscape-primary",
     "landscape-secondary"
 };
 
-enum OrientationLockType {
-    "any",
-    "natural",
-    "landscape",
-    "portrait",
+enum OrientationType {
     "portrait-primary",
     "portrait-secondary",
     "landscape-primary",
@@ -21,11 +21,14 @@ enum OrientationLockType {
 };
 
 [
+    GarbageCollected,
     RuntimeEnabled=ScreenOrientation
-] partial interface Screen {
-    readonly attribute OrientationType orientation;
+] interface ScreenOrientation : EventTarget {
+    readonly attribute unsigned short angle;
+    readonly attribute DOMString type;
 
-    [CallWith=ScriptState] Promise lockOrientation(OrientationLockType orientation);
+    [CallWith=ScriptState] Promise lock(OrientationLockType orientation);
+    void unlock();
 
-    void unlockOrientation();
+    attribute EventHandler onchange;
 };