Reland of [Memory UMA] Return the extra_processes_dump map as part of the ResponseCallback

mojo/common/common_custom_types_struct_traits.h

Index: mojo/common/common_custom_types_struct_traits.h
diff --git a/mojo/common/common_custom_types_struct_traits.h b/mojo/common/common_custom_types_struct_traits.h
index b20c795b96562e936573eb535e41cb3baf7c55b3..426489ff031678d59b4427619530f9fc249b9569 100644
--- a/mojo/common/common_custom_types_struct_traits.h
+++ b/mojo/common/common_custom_types_struct_traits.h
@@ -7,11 +7,13 @@
 
 #include "base/files/file.h"
 #include "base/i18n/rtl.h"
+#include "base/process/process_handle.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/unguessable_token.h"
 #include "base/version.h"
 #include "mojo/common/file.mojom-shared.h"
 #include "mojo/common/mojo_common_export.h"
+#include "mojo/common/process_id.mojom-shared.h"
 #include "mojo/common/string16.mojom-shared.h"
 #include "mojo/common/text_direction.mojom-shared.h"
 #include "mojo/common/time.mojom-shared.h"
@@ -63,6 +65,19 @@
 };
 
 template <>
+struct StructTraits<common::mojom::ProcessIdDataView, base::ProcessId> {
+  static uint32_t pid(const base::ProcessId& process_id) {
+    return static_cast<uint32_t>(process_id);
+  }
+
+  static bool Read(common::mojom::ProcessIdDataView data,
+                   base::ProcessId* process_id) {
+    *process_id = static_cast<base::ProcessId>(data.pid());
+    return true;
+  }
+};
+
+template <>
 struct StructTraits<common::mojom::TimeDeltaDataView, base::TimeDelta> {
   static int64_t microseconds(const base::TimeDelta& delta) {
     return delta.InMicroseconds();