Invoke measure conversion from fetch

Author: apasel422

api.bs

@@ -1528,6 +1528,14 @@ The <dfn method for=Attribution>measureConversion(|options|)</dfn> method steps
 
 1.  Let |implicitInputs| be the result of [=obtaining the implicit API inputs=] from [=this=].
 1.  [=Assert=]: |implicitInputs| is not null.
+1.  Return the result of running [=measure a conversion=] with |options| and |implicitInputs|.
+
+</div>
+
+<div algorithm>
+To <dfn>measure a conversion</dfn> given {{AttributionConversionOptions}} |options|
+and [=implicit API inputs=] |implicitInputs|:
+
 1.  Let |document| be |implicitInputs|'s [=implicit API inputs/associated document=].
 1.  Let |realm| be |document|'s [=relevant realm=].
 1.  If |document| is not [=allowed to use=] the [=policy-controlled feature=] named
@@ -2232,13 +2240,27 @@ and [=response=] |response|, run these steps:
 
 1.  Let |saveImpressionHeader| be the result of [=header list/get|getting=] <code>[:Save-Impression:]</code> from |response|'s [=response/header list=].
 
-1.  If |saveImpressionHeader| is null, return.
+1.  If |saveImpressionHeader| is not null:
+
+    1.  Let |impressionOptions| be the result of [=parse a Save-Impression header|parsing=] |saveImpressionHeader|.
+
+    1.  If |impressionOptions| is not an error, [=save an impression|Save=] |impressionOptions| with |implicitInputs|.
+
+1.  Let |measureConversionHeader| be the result of [=header list/get|getting=] <code>[:Measure-Conversion:]</code> from |response|'s [=response/header list=].
+
+1.  If |measureConversionHeader| is not null:
+
+    1.  Let |parseConversionResult| be the result of [=parse a Measure-Conversion header|parsing=] |measureConversionHeader|.
+
+    1.  If |parseConversionResult| is not an error:
+
+        1.  Let (|conversionOptions|, |reportUrl|) be |parseConversionResult|.
 
-1.  Let |impressionOptions| be the result of [=parse a Save-Impression header|parsing=] |saveImpressionHeader|.
+        1.  Let |reportPromise| be the result of running [=measure a conversion=] with |conversionOptions| and |implicitInputs|.
 
-1.  If |impressionOptions| is an error, return.
+        1.  [=In parallel=], [=upon fulfillment=] of |reportPromise|, [=send a report=] with its value and |reportUrl|.
 
-1.  [=save an impression|Save=] |impressionOptions| with |implicitInputs|.
+Issue: Confirm the desired semantics of [:Save-Impression:] and [:Measure-Conversion:] in the same response.
 
 </div>