Update WebVR API based on prerelease 1.1 except window and navigator interface

third_party/WebKit/Source/modules/vr/VRDisplay.idl

Index: third_party/WebKit/Source/modules/vr/VRDisplay.idl
diff --git a/third_party/WebKit/Source/modules/vr/VRDisplay.idl b/third_party/WebKit/Source/modules/vr/VRDisplay.idl
index 2a00e74454067a232042a7d6d445792280fad8bf..0d08dda34b7c429d1fc5cd99e65b66c401a7aaff 100644
--- a/third_party/WebKit/Source/modules/vr/VRDisplay.idl
+++ b/third_party/WebKit/Source/modules/vr/VRDisplay.idl
@@ -23,9 +23,9 @@ enum VREye {
     readonly attribute boolean isPresenting;
 
     // [Constant]?
-    readonly attribute VRDisplayCapabilities capabilities;
+    [SaveSameObject]readonly attribute VRDisplayCapabilities capabilities;
 
-    readonly attribute VRStageParameters stageParameters;
+    readonly attribute VRStageParameters? stageParameters;
 
     boolean getFrameData(VRFrameData frameData);
     [DeprecateAs=VRDeprecatedGetPose] VRPose getPose();
@@ -41,13 +41,13 @@ enum VREye {
 
     // Begin presenting to the VRDisplay. Must be called in response to a user gesture.
     // Repeat calls while already presenting will update the VRLayer being displayed.
-    [CallWith=ScriptState] Promise requestPresent(sequence<VRLayer> layers);
+    [CallWith=ScriptState] Promise requestPresent(sequence<VRLayerInit> layers);
 
     // Stops presenting to the VRDisplay.
     [CallWith=ScriptState] Promise exitPresent();
 
     // Get the sources currently being presented.
-    sequence<VRLayer> getLayers();
+    sequence<VRLayerInit> getLayers();
 
     // The VRLayer provided to the `VRDisplay` will be captured and presented
     // in the HMD. Calling this function has the same effect on the source