Introduce mojo interface for collecting StackSamplingProfiler data

components/metrics/BUILD.gn

Index: components/metrics/BUILD.gn
diff --git a/components/metrics/BUILD.gn b/components/metrics/BUILD.gn
index 95dfabbb9ad7dd92402ea8214fbe8b9b60e494e1..8e312c746583e42f7ae434a95e85bb11ca242029 100644
--- a/components/metrics/BUILD.gn
+++ b/components/metrics/BUILD.gn
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//mojo/public/tools/bindings/mojom.gni")
+
 declare_args() {
   # Overrides os name in uma metrics log to "Blimp".
   metrics_use_blimp = false
@@ -83,6 +85,7 @@ static_library("metrics") {
     "//components/metrics/proto",
   ]
   deps = [
+    ":mojo_bindings",
     "//base",
     "//base:base_static",
     "//components/prefs",
@@ -109,6 +112,20 @@ static_library("metrics") {
   }
 }
 
+mojom("mojo_bindings") {
+  sources = [
+    "call_stack_profile_collector.mojom",
+  ]
+
+  deps = [
+    "//mojo/common:common_custom_types",
+  ]
+
+  public_deps = [
+    "//skia/public/interfaces",
+  ]
+}
+
 if (!is_ios) {
   # GYP version: components/metrics.gypi:metrics_gpu
   static_library("gpu") {
@@ -275,10 +292,23 @@ if (is_linux) {
   }
 }
 
+mojom("mojo_test_bindings") {
+  sources = [
+    "call_stack_profile_collector_test.mojom",
+  ]
+
+  deps = [
+    ":mojo_bindings",
+    "//mojo/common:common_custom_types",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
+    "call_stack_profile_collector_test.mojom",
     "call_stack_profile_metrics_provider_unittest.cc",
+    "call_stack_profile_struct_traits_unittest.cc",
     "cloned_install_detector_unittest.cc",
     "daily_event_unittest.cc",
     "data_use_tracker_unittest.cc",
@@ -301,6 +331,7 @@ source_set("unit_tests") {
 
   deps = [
     ":metrics",
+    ":mojo_test_bindings",
     ":net",
     ":profiler",
     ":test_support",