Catch WipError on calls to resume and map to appropriate RPC error code (#2134)

Author: elliette

dwds/CHANGELOG.md

@@ -6,6 +6,7 @@
 - Display type objects concisely. - [#2103](https://github.com/dart-lang/webdev/pull/2103)
 - Support using scope in `ChromeProxyService.evaluateInFrame`. - [#2122](https://github.com/dart-lang/webdev/pull/2122)
 - Check for new events more often in batched stream. - [#2123](https://github.com/dart-lang/webdev/pull/2123)
+- Map Chrome error on `resume` to the same error returned by the Dart VM. - [#2133](https://github.com/dart-lang/webdev/issues/2133) 
 
 ## 19.0.0
 

dwds/lib/src/services/chrome_proxy_service.dart

@@ -885,20 +885,32 @@ ${globalLoadStrategy.loadModuleSnippet}("dart_sdk").developer.invokeExtension(
     String? step,
     int? frameIndex,
   }) async {
-    if (inspector.appConnection.isStarted) {
-      return captureElapsedTime(
-        () async {
-          await isInitialized;
-          await isStarted;
-          _checkIsolate('resume', isolateId);
-          return await (await debuggerFuture)
-              .resume(step: step, frameIndex: frameIndex);
-        },
-        (result) => DwdsEvent.resume(step),
-      );
-    } else {
-      inspector.appConnection.runMain();
-      return Success();
+    try {
+      if (inspector.appConnection.isStarted) {
+        return captureElapsedTime(
+          () async {
+            await isInitialized;
+            await isStarted;
+            _checkIsolate('resume', isolateId);
+            return await (await debuggerFuture)
+                .resume(step: step, frameIndex: frameIndex);
+          },
+          (result) => DwdsEvent.resume(step),
+        );
+      } else {
+        inspector.appConnection.runMain();
+        return Success();
+      }
+    } on WipError catch (e) {
+      final errorMessage = e.message;
+      if (errorMessage != null &&
+          errorMessage.contains('Can only perform operation while paused')) {
+        // TODO(https://github.com/dart-lang/sdk/issues/52636): Use error code
+        // from package:vm_service.
+        const kIsolateMustBePausedCode = 106;
+        throw RPCError('resume', kIsolateMustBePausedCode, errorMessage);
+      }
+      rethrow;
     }
   }