[spec] Add trustedBiddingSignalsSlotSizeMode

And related auctionConfig field.

This corresponds to the explainer changes in WICG#928.

spec.bs

@@ -705,6 +705,7 @@ dictionary AuctionAdConfig {
   sequence<USVString> interestGroupBuyers;
   Promise<any> auctionSignals;
   record<DOMString, DOMString> requestedSize;
+  sequence<record<DOMString, DOMString>> allSlotsRequestedSizes;
   Promise<any> sellerSignals;
   Promise<DOMString> directFromSellerSignalsHeaderAdSlot;
   unsigned long long sellerTimeout;
@@ -1087,23 +1088,20 @@ To <dfn>validate and convert auction ad config</dfn> given an {{AuctionAdConfig}
       result of [=serializing a JavaScript value to a JSON string=].
     * To handle an error, set |auctionConfig|'s [=auction config/auction signals=] to failure.
 1. If |config|["{{AuctionAdConfig/requestedSize}}"] [=map/exists=]:
-  1. Let |requestedSize| be |config|["{{AuctionAdConfig/requestedSize}}"]
-  1. If |requestedSize|["height"] does not [=map/exist=], throw a {{TypeError}}.
-
-  1. If |requestedSize|["width"] does not [=map/exist=], throw a {{TypeError}}.
-
-  1. Let |width| and |widthUnit| be the dimension and dimension unit that results from running
-    [=parse an AdRender dimension value=] with |requestedSize|["width"], respectively.
-  1. If |width| is null, throw a {{TypeError}}.
-
-  1. Let |height| and |heightUnit| be the dimension and dimension unit that results from running
-    [=parse an AdRender dimension value=] with |requestedSize|["height"], respectively.
-  1. If |height| is null, throw a {{TypeError}}.
-
-  1. Let |adSize| be a new [=ad size=].
-  1. Set |adSize|'s [=ad size/width=] to |width|, [=ad size/width units=] to |widthUnit|,
-    [=ad size/height=] to |height|, [=ad size/height units=] to |heightUnit|.
+  1. Let |adSize| be the result from running [=parse an ad size value=] with
+    |config|["{{AuctionAdConfig/requestedSize}}"]
+  1. If |adSize| is null, throw a {{TypeError}}.
   1. Set |auctionConfig|'s [=auction config/requested size=] to |adSize|.
+1. If |config|["{{AuctionAdConfig/allSlotsRequestedSizes}}"] [=map/exists=]:
+  1. If |config|["{{AuctionAdConfig/allSlotsRequestedSizes}}"] is [=list/empty=]:
+    1. Throw a {{TypeError}}.
+  1. [=list/For each=] |adSizeValue| in |config|["{{AuctionAdConfig/allSlotsRequestedSizes}}"]:
+    1. Let |adSize| be the result of running [=parse an ad size value=] with |adSizeValue|.
+    1. If |adSize| is null, throw a {{TypeError}}.
+    1. [=list/Append=] |adSize| to |auctionConfig|'s [=auction config/all slots requested sizes=].
+  1. If |auctionConfig|'s [=auction config/requested size=] is not null, and |auctionConfig|'s
+    [=auction config/all slots requested sizes=] does not [=list/contain=] |auctionConfig|'s
+    [=auction config/requested size=], throw a {{TypeError}}.
 1. If |config|["{{AuctionAdConfig/sellerSignals}}"] [=map/exists=]:
   1. Set |auctionConfig|'s [=auction config/seller signals=] to
     |config|["{{AuctionAdConfig/sellerSignals}}"].
@@ -4337,6 +4335,9 @@ An auction config is a [=struct=] with the following items:
 : <dfn>requested size</dfn>
 :: Null or an [=ad size=], initially null.
   The size of the frame for the ad being selected by the auction.
+: <dfn>all slots requested sizes</dfn>
+:: Null or a [=list] of [=ad sizes=', initially null.
+  The size of all frames for ads being selected by any auction in the frame.
 : <dfn>seller signals</dfn>
 :: Null, a [=string=], a {{Promise}}, or failure.
   Opaque JSON data passed to the seller's [=script runner=].
@@ -4617,6 +4618,23 @@ Width and height of an ad.
 : <dfn>height units</dfn>
 :: A [=string=]. Can only be one of "px" (pixel), "sh" (screen height), and "sw" (screen width).
 
+<div algorith>
+  To <dfn>parse an AdRender ad size</dfn> given an [=object=] |adSlotSize|:
+
+  1. If |adSlotSize|["height"] does not [=map/exist=], return null.
+  1. If |adSlotSize|["width"] does not [=map/exist=], return null.
+  1. Let |width| and |widthUnit| be the dimension and dimension unit that results from running
+    [=parse an AdRender dimension value=] with |adSlotSize|["width"], respectively.
+  1. If |width| is null, return null.
+  1. Let |height| and |heightUnit| be the dimension and dimension unit that results from running
+    [=parse an AdRender dimension value=] with |adSlotSize|["height"], respectively.
+  1. If |height| is null, return null.
+  1. Let |adSize| be a new [=ad size=].
+  1. Set |adSize|'s [=ad size/width=] to |width|, [=ad size/width units=] to |widthUnit|,
+    [=ad size/height=] to |height|, [=ad size/height units=] to |heightUnit|.
+  1. return |adSize|.
+</div>
+
 </dl>
 
 <h3 id=direct-from-seller-signals-section>Direct from seller signals</h3>