Add type inference for switch statements.

pkg/front_end/testcases/inference_new/switch.dart.outline.expect

Index: pkg/front_end/testcases/inference_new/switch.dart.outline.expect
diff --git a/pkg/front_end/testcases/inference_new/switch.dart.outline.expect b/pkg/front_end/testcases/inference_new/switch.dart.outline.expect
new file mode 100644
index 0000000000000000000000000000000000000000..052db936fdef74226f6578719e0261c85b6cae87
--- /dev/null
+++ b/pkg/front_end/testcases/inference_new/switch.dart.outline.expect
@@ -0,0 +1,14 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+class C<T extends core::Object> extends core::Object {
+  const constructor •() → void
+    ;
+}
+static method f<T extends core::Object>() → self::f::T
+  ;
+static method test(self::C<core::int> x) → void
+  ;
+static method main() → dynamic
+  ;