Second reland: Introduce mojo interface for collecting StackSamplingProfiler data

components/metrics/public/cpp/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("unit_tests") {
+import("//mojo/public/tools/bindings/mojom.gni")
+
+source_set("call_stack_unit_tests") {
   testonly = true
   sources = [
-    "autofill_types_struct_traits_unittest.cc",
-  ]
-
-  public_deps = [
-    "../interfaces:test_types",
+    "call_stack_profile_struct_traits_unittest.cc",
   ]
 
   deps = [
     "//base",
-    "//components/autofill/core/browser:test_support",
-    "//components/password_manager/core/common",
+    "//components/metrics/public/interfaces:call_stack_mojo_test_bindings",
     "//mojo/public/cpp/bindings",
     "//testing/gtest",
   ]
 }