AI: pass modelVersion through from Aida => GCA translation

I noticed that this field was missing, and it's really helpful when
debugging to see which version is running on your machine.

R=leese@chromium.org

Fixed: 501043294
Change-Id: I70132eb5da0936309730e904b3966da89d22bb50
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7743322
Commit-Queue: Eric Leese <leese@chromium.org>
Auto-Submit: Jack Franklin <jacktfranklin@chromium.org>
Reviewed-by: Eric Leese <leese@chromium.org>

Author: jackfranklin

front_end/core/host/AidaClientTypes.ts

@@ -384,10 +384,15 @@ export interface FactualityMetadata {
   facts: FactualityFact[];
 }
 
+export interface InferenceOptionMetadata {
+  modelId: string;
+}
+
 export interface ResponseMetadata {
   rpcGlobalId?: RpcGlobalId;
   attributionMetadata?: AttributionMetadata;
   factualityMetadata?: FactualityMetadata;
+  inferenceOptionMetadata?: InferenceOptionMetadata;
 }
 
 export interface DoConversationResponse {

front_end/core/host/AidaGcaTranslation.test.ts

@@ -564,4 +564,36 @@ describe('AidaGcaTranslation', () => {
       });
     });
   });
+
+  describe('GCA GenerateContentResponse to AIDA ChunkResponse', () => {
+    it('translates a basic chunk response and includes modelVersion', () => {
+      const gcaResponse = createGcaResponse({
+        modelVersion: 'gen-model',
+        responseId: 'response-789',
+        candidates: [{
+          index: 0,
+          content: {role: 'model', parts: [{text: 'const add = (a, b) => a + b;'}]},
+          finishReason: GcaTypes.FinishReason.STOP,
+          safetyRatings: [],
+          citationMetadata: {citations: []},
+          groundingMetadata: {},
+          aicodeOutput: {contents: []},
+        }],
+      });
+
+      assert.deepEqual(AidaGcaTranslation.gcaChunkResponseToAidaChunkResponse(gcaResponse), [{
+                         textChunk: {
+                           text: 'const add = (a, b) => a + b;',
+                         },
+                         metadata: {
+                           rpcGlobalId: 'response-789',
+                           attributionMetadata: {
+                             attributionAction: AidaClient.RecitationAction.CITE,
+                             citations: [],
+                           },
+                           inferenceOptionMetadata: {modelId: 'gen-model'},
+                         },
+                       }]);
+    });
+  });
 });

front_end/core/host/AidaGcaTranslation.ts

@@ -454,6 +454,7 @@ export function gcaChunkResponseToAidaChunkResponse(response: GCA.GenerateConten
     const parts = candidate?.content?.parts || [];
     const metadata: AIDA.ResponseMetadata = {
       rpcGlobalId: response.responseId,
+      inferenceOptionMetadata: {modelId: response.modelVersion}
     };
 
     if (candidate?.citationMetadata?.citations) {