Update register user impression time calculation to avoid decimals

Bug: 436203675
Change-Id: I3e21dd2016d0a786b99e9e69b2f2e28c5d0ecddf
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6866470
Commit-Queue: Samiya Caur <[email protected]>
Reviewed-by: Ergün Erdoğmuş <[email protected]>
Auto-Submit: Samiya Caur <[email protected]>
Commit-Queue: Ergün Erdoğmuş <[email protected]>

Author: Samiya Caur

front_end/models/ai_code_completion/AiCodeCompletion.ts

@@ -223,7 +223,7 @@ export class AiCodeCompletion extends Common.ObjectWrapper.ObjectWrapper<EventTy
   #registerUserImpression(rpcGlobalId: Host.AidaClient.RpcGlobalId, sampleId: number, latency: number): void {
     const seconds = Math.floor(latency / 1_000);
     const remainingMs = latency % 1_000;
-    const nanos = remainingMs * 1_000_000;
+    const nanos = Math.floor(remainingMs * 1_000_000);
 
     void this.#aidaClient.registerClientEvent({
       corresponding_aida_rpc_global_id: rpcGlobalId,