Set process phases in the StackSamplingProfiler.

components/metrics/public/cpp/call_stack_profile_struct_traits.h

Index: components/metrics/public/cpp/call_stack_profile_struct_traits.h
diff --git a/components/metrics/public/cpp/call_stack_profile_struct_traits.h b/components/metrics/public/cpp/call_stack_profile_struct_traits.h
index 99c4fe3c8a9dc6da20651cbba13399325bf97b1a..ddf78d5f3c9b5139d02803ea5d8ed4e7f3844cb5 100644
--- a/components/metrics/public/cpp/call_stack_profile_struct_traits.h
+++ b/components/metrics/public/cpp/call_stack_profile_struct_traits.h
@@ -82,9 +82,9 @@ struct StructTraits<metrics::mojom::CallStackSampleDataView,
       const base::StackSamplingProfiler::Sample& sample) {
     return sample.frames;
   }
-  static int32_t process_phases(
+  static int32_t process_milestones(
       const base::StackSamplingProfiler::Sample& sample) {
-    return sample.process_phases;
+    return sample.process_milestones;
   }
 
   static bool Read(metrics::mojom::CallStackSampleDataView data,
@@ -95,7 +95,7 @@ struct StructTraits<metrics::mojom::CallStackSampleDataView,
 
     *out = base::StackSamplingProfiler::Sample();
     out->frames = std::move(frames);
-    out->process_phases = data.process_phases();
+    out->process_milestones = data.process_milestones();
     return true;
   }
 };