chore: force lo dpi recording on non-mac (#4557)

test/assets/highdpi.html

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+<style>
+html { background-image: url(image1x.jpg); }
+
+@media(-webkit-min-device-pixel-ratio: 1.5) {
+  html { background-image: url(image2x.jpg); }
+}
+</style>

test/browsercontext-dsf.spec.ts

@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { it, expect } from './fixtures';
+
+it('should fetch lodpi assets', async ({ contextFactory, server}) => {
+  const context = await contextFactory({
+    deviceScaleFactor: 1
+  });
+  const page = await context.newPage();
+  const [ request ] = await Promise.all([
+    page.waitForRequest('**/image*'),
+    page.goto(server.PREFIX + '/highdpi.html'),
+  ]);
+  expect(request.url()).toContain('image1x');
+});
+
+it('should fetch hidpi assets', async ({ contextFactory, server }) => {
+  const context = await contextFactory({
+    deviceScaleFactor: 2
+  });
+  const page = await context.newPage();
+  const [ request ] = await Promise.all([
+    page.waitForRequest('**/image*'),
+    page.goto(server.PREFIX + '/highdpi.html'),
+  ])
+  expect(request.url()).toContain('image2x');
+});