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

mojo/common/common_custom_types_struct_traits.h

 // 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.
 
 #ifndef MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_H_
 #define MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_H_
 
 #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"
 #include "mojo/common/unguessable_token.mojom-shared.h"
 #include "mojo/common/version.mojom-shared.h"
 
 namespace mojo {
 
 template <>
 struct StructTraits<common::mojom::String16DataView, base::string16> {
@@ skipping 31 matching lines @@
 
   static uint64_t low(const base::UnguessableToken& token) {
     return token.GetLowForSerialization();
   }
 
   static bool Read(common::mojom::UnguessableTokenDataView data,
                    base::UnguessableToken* out);
 };
 
 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();
   }
 
   static bool Read(common::mojom::TimeDeltaDataView data,
                    base::TimeDelta* delta) {
     *delta = base::TimeDelta::FromMicroseconds(data.microseconds());
     return true;
   }
@@ skipping 13 matching lines @@
 struct EnumTraits<common::mojom::TextDirection, base::i18n::TextDirection> {
   static common::mojom::TextDirection ToMojom(
       base::i18n::TextDirection text_direction);
   static bool FromMojom(common::mojom::TextDirection input,
                         base::i18n::TextDirection* out);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_COMMON_CUSTOM_TYPES_STRUCT_TRAITS_H_