memory-infra: Plumb platform_private_footprint to MemoryDumpManager

base/trace_event/memory_dump_request_args.h

Index: base/trace_event/memory_dump_request_args.h
diff --git a/base/trace_event/memory_dump_request_args.h b/base/trace_event/memory_dump_request_args.h
index bc5cc38ecdb9ebd3ea90933928c5e88317d7786f..9eb6ade350695561e0f11dd95f971d4177822644 100644
--- a/base/trace_event/memory_dump_request_args.h
+++ b/base/trace_event/memory_dump_request_args.h
@@ -16,6 +16,7 @@
 #include "base/callback.h"
 #include "base/optional.h"
 #include "base/process/process_handle.h"
+#include "base/trace_event/process_memory_totals.h"
 
 namespace base {
 namespace trace_event {
@@ -83,6 +84,7 @@ struct MemoryDumpArgs {
 struct BASE_EXPORT MemoryDumpCallbackResult {
   struct OSMemDump {
     uint32_t resident_set_kb = 0;
+    ProcessMemoryTotals::PlatformPrivateFootprint platform_private_footprint;
   };
   struct ChromeMemDump {
     uint32_t malloc_total_kb = 0;