Second reland: Introduce mojo interface for collecting StackSamplingProfiler data

components/metrics/public/interfaces/call_stack_profile_collector_test.mojom

Index: components/metrics/public/interfaces/call_stack_profile_collector_test.mojom
diff --git a/components/metrics/public/interfaces/call_stack_profile_collector_test.mojom b/components/metrics/public/interfaces/call_stack_profile_collector_test.mojom
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index 0000000000000000000000000000000000000000..4409ee28b5f2d04a805f8697413e269912fd2074
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+++ b/components/metrics/public/interfaces/call_stack_profile_collector_test.mojom
@@ -0,0 +1,18 @@
+// 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.
+
+module metrics.mojom;
+
+import "components/metrics/public/interfaces/call_stack_profile_collector.mojom";
+
+interface CallStackProfileCollectorTest {
+  [Sync]
+  BounceFrame(CallStackFrame in) => (CallStackFrame out);
+
+  [Sync]
+  BounceModule(CallStackModule in) => (CallStackModule out);
+
+  [Sync]
+  BounceProfile(CallStackProfile in) => (CallStackProfile out);
+};