Add usage with import ‘babel-polyfill’ fixture.

experimental/babel-preset-env/test/debug-fixtures/usage-with-import/in/in.js

@@ -0,0 +1 @@
+import 'babel-polyfill';

experimental/babel-preset-env/test/debug-fixtures/usage-with-import/options.json

@@ -0,0 +1,11 @@
+{
+  "presets": [
+    ["../../lib", {
+      "debug": true,
+      "targets": {
+        "chrome": 55
+      },
+      "useBuiltIns": "usage"
+    }]
+  ]
+}

experimental/babel-preset-env/test/debug-fixtures/usage-with-import/stderr.txt

@@ -0,0 +1,2 @@
+When setting `useBuiltIns: 'usage'`, polyfills are automatically imported when needed.
+  Please remove the `import 'babel-polyfill'` call or use `useBuiltIns: 'entry'` instead.

experimental/babel-preset-env/test/debug-fixtures/usage-with-import/stdout.txt

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+babel-preset-env: `DEBUG` option
+
+Using targets:
+{
+  "chrome": "55"
+}
+
+Using modules transform: commonjs
+
+Using plugins:
+  syntax-trailing-function-commas { "chrome":"55" }
+
+Using polyfills with `usage` option:
+
+  When setting `useBuiltIns: 'usage'`, polyfills are automatically imported when needed.
+  Please remove the `import 'babel-polyfill'` call or use `useBuiltIns: 'entry'` instead.
+
+[index.js] Based on your code and targets, none were added.
+src/in.js -> lib/in.js