Reland of [tracing] Dump child processes' memory metrics in browser

base/BUILD.gn

Index: base/BUILD.gn
diff --git a/base/BUILD.gn b/base/BUILD.gn
index d5b815d207a85f98da84aba2243da59f3c8291c7..8c73a6e475ec2ccb4b97d9d736cdc036d38eca24 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -842,11 +842,8 @@
     "trace_event/process_memory_dump.h",
     "trace_event/process_memory_maps.cc",
     "trace_event/process_memory_maps.h",
-    "trace_event/process_memory_maps_dump_provider.h",
     "trace_event/process_memory_totals.cc",
     "trace_event/process_memory_totals.h",
-    "trace_event/process_memory_totals_dump_provider.cc",
-    "trace_event/process_memory_totals_dump_provider.h",
     "trace_event/trace_buffer.cc",
     "trace_event/trace_buffer.h",
     "trace_event/trace_config.cc",
@@ -987,7 +984,6 @@
       "sys_info_linux.cc",
       "trace_event/malloc_dump_provider.cc",
       "trace_event/malloc_dump_provider.h",
-      "trace_event/process_memory_maps_dump_provider.cc",
     ]
     set_sources_assignment_filter(sources_assignment_filter)
 
@@ -1054,7 +1050,6 @@
       "sync_socket_posix.cc",
       "sys_info.cc",
       "sys_info_posix.cc",
-      "trace_event/process_memory_totals_dump_provider.cc",
       "trace_event/trace_event_system_stats_monitor.cc",
     ]
 
@@ -1183,7 +1178,6 @@
     sources += [
       "trace_event/malloc_dump_provider.cc",
       "trace_event/malloc_dump_provider.h",
-      "trace_event/process_memory_maps_dump_provider.cc",
     ]
 
     if (is_asan || is_lsan || is_msan || is_tsan) {
@@ -1820,7 +1814,6 @@
     "trace_event/memory_allocator_dump_unittest.cc",
     "trace_event/memory_dump_manager_unittest.cc",
     "trace_event/process_memory_dump_unittest.cc",
-    "trace_event/process_memory_totals_dump_provider_unittest.cc",
     "trace_event/trace_config_memory_test_util.h",
     "trace_event/trace_config_unittest.cc",
     "trace_event/trace_event_argument_unittest.cc",
@@ -1935,10 +1928,6 @@
     }
   }
 
-  if (is_linux || is_android) {
-    sources += [ "trace_event/process_memory_maps_dump_provider_unittest.cc" ]
-  }
-
   if (!is_linux || use_ozone) {
     sources -= [ "message_loop/message_pump_glib_unittest.cc" ]
   }