[web_benchmarks] Remove WebRenderer enum. (#8103)

Removes the `WebRenderer` enum, and its uses in the `CompilationOptions` class.

This is a breaking change because it's removing public API (`CompilationOptions.renderer`, `WebRenderer`), but in *practice* people shouldn't need any changes to their code (since the `CompilationOptions` class is used through named constructors). In any case, labeling as `v4.0.0`.

Related: flutter/flutter#145954

Author: ditman

packages/web_benchmarks/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 4.0.0
+
+* **Breaking change:** Removes `CompilationOptions.renderer` and the
+  `WebRenderer` enum.
+
 ## 3.1.1
 
 * Adds `missing_code_block_language_in_doc_comment` lint.

packages/web_benchmarks/lib/src/compilation_options.dart

@@ -8,35 +8,16 @@
 /// should be built.
 class CompilationOptions {
   /// Creates a [CompilationOptions] object that compiles to JavaScript.
-  const CompilationOptions.js({
-    this.renderer = WebRenderer.canvaskit,
-  }) : useWasm = false;
+  const CompilationOptions.js() : useWasm = false;
 
   /// Creates a [CompilationOptions] object that compiles to WebAssembly.
-  const CompilationOptions.wasm()
-      : useWasm = true,
-        renderer = WebRenderer.skwasm;
-
-  /// The renderer to use for the build.
-  final WebRenderer renderer;
+  const CompilationOptions.wasm() : useWasm = true;
 
   /// Whether to build the app with dart2wasm.
   final bool useWasm;
 
   @override
   String toString() {
-    return '(renderer: ${renderer.name}, compiler: ${useWasm ? 'dart2wasm' : 'dart2js'})';
+    return '(compiler: ${useWasm ? 'dart2wasm' : 'dart2js'})';
   }
 }
-
-/// The possible types of web renderers Flutter can build for.
-enum WebRenderer {
-  /// The HTML web renderer.
-  html,
-
-  /// The CanvasKit web renderer.
-  canvaskit,
-
-  /// The SKIA Wasm web renderer.
-  skwasm,
-}

packages/web_benchmarks/lib/src/runner.dart

@@ -141,8 +141,7 @@ class BenchmarkServer {
         if (compilationOptions.useWasm) ...<String>[
           '--wasm',
           '--no-strip-wasm',
-        ] else
-          '--web-renderer=${compilationOptions.renderer.name}',
+        ],
         '--dart-define=FLUTTER_WEB_ENABLE_PROFILING=true',
         if (!treeShakeIcons) '--no-tree-shake-icons',
         '--profile',

packages/web_benchmarks/pubspec.yaml

@@ -2,7 +2,7 @@ name: web_benchmarks
 description: A benchmark harness for performance-testing Flutter apps in Chrome.
 repository: https://github.com/flutter/packages/tree/main/packages/web_benchmarks
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+web_benchmarks%22
-version: 3.1.1
+version: 4.0.0
 
 environment:
   sdk: ^3.3.0