Add deprecation messages to deprecated parts of the WebVR API.

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index d53d32dbbd7c770fb3580619bb4a5e58c77dc271..a22211b8793e2feb0452887c3c0558f9c978935a 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -400,6 +400,12 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature)
     case UseCounter::PaymentAddressCareOf:
         return willBeRemoved("PaymentAddress.careOf", M56, "5728579069411328");
 
+    case UseCounter::VRDeprecatedFieldOfView:
+        return String::format("VREyeParameters.fieldOfView is deprecated and will be removed in %s.  Prefer using the projection matrices provided by VRFrameData instead.  See https://www.chromestatus.com/features/4532810371039232 for more details.", milestoneString(M57));

[ddorwin, 2016/10/05 21:32:43]

WouldreplacedBy work?

The chromestatus URL doesn't appear to have useful information for this specific
case, so we probably don't need that.

We lose the milestone, but that's not necessarily a bad thing.

[billorr, 2016/10/05 21:55:27]

Sure - I can switch to that if we don't need the milestone.

[billorr, 2016/10/05 22:47:55]

Done.

+
+    case UseCounter::VRDeprecatedGetPose:
+        return String::format("VRDisplay.getPose() is deprecated and will be removed in %s.  Prefer using VRDisplay.getFrameData() instead.  See https://www.chromestatus.com/features/4532810371039232 for more details.", milestoneString(M57));

[ddorwin, 2016/10/05 21:32:43]

ditto

[billorr, 2016/10/05 21:55:27]

Acknowledged.

[billorr, 2016/10/05 22:47:55]

Done.

+
     // Features that aren't deprecated don't have a deprecation message.
     default:
         return String();