[memory-infra] Whitelist sync model type counters.

base/trace_event/memory_infra_background_whitelist.cc

Index: base/trace_event/memory_infra_background_whitelist.cc
diff --git a/base/trace_event/memory_infra_background_whitelist.cc b/base/trace_event/memory_infra_background_whitelist.cc
index ea37739430cdb7ece6e5e978ba5adbb7a3758513..d6e9f5d16f7a57bce5b14ab922d4d7682ba96e04 100644
--- a/base/trace_event/memory_infra_background_whitelist.cc
+++ b/base/trace_event/memory_infra_background_whitelist.cc
@@ -88,6 +88,42 @@ const char* const kAllocatorDumpNameWhitelist[] = {
     "winheap/allocated_objects",
     "sync/0x?/kernel",
     "sync/0x?/store",
+    "sync/0x?/model_type/APP",
+    "sync/0x?/model_type/APP_LIST",
+    "sync/0x?/model_type/APP_NOTIFICATION",
+    "sync/0x?/model_type/APP_SETTING",
+    "sync/0x?/model_type/ARC_PACKAGE",
+    "sync/0x?/model_type/ARTICLE",
+    "sync/0x?/model_type/AUTOFILL",
+    "sync/0x?/model_type/AUTOFILL_PROFILE",
+    "sync/0x?/model_type/AUTOFILL_WALLET",
+    "sync/0x?/model_type/BOOKMARK",
+    "sync/0x?/model_type/DEVICE_INFO",
+    "sync/0x?/model_type/DICTIONARY",
+    "sync/0x?/model_type/EXPERIMENTS",
+    "sync/0x?/model_type/EXTENSION",
+    "sync/0x?/model_type/EXTENSION_SETTING",
+    "sync/0x?/model_type/FAVICON_IMAGE",
+    "sync/0x?/model_type/FAVICON_TRACKING",
+    "sync/0x?/model_type/HISTORY_DELETE_DIRECTIVE",
+    "sync/0x?/model_type/MANAGED_USER",
+    "sync/0x?/model_type/MANAGED_USER_SETTING",
+    "sync/0x?/model_type/MANAGED_USER_SHARED_SETTING",
+    "sync/0x?/model_type/MANAGED_USER_WHITELIST",
+    "sync/0x?/model_type/NIGORI",
+    "sync/0x?/model_type/PASSWORD",
+    "sync/0x?/model_type/PREFERENCE",
+    "sync/0x?/model_type/PRINTER",
+    "sync/0x?/model_type/PRIORITY_PREFERENCE",
+    "sync/0x?/model_type/READING_LIST",
+    "sync/0x?/model_type/SEARCH_ENGINE",
+    "sync/0x?/model_type/SESSION",
+    "sync/0x?/model_type/SYNCED_NOTIFICATION",
+    "sync/0x?/model_type/SYNCED_NOTIFICATION_APP_INFO",
+    "sync/0x?/model_type/THEME",
+    "sync/0x?/model_type/TYPED_URL",
+    "sync/0x?/model_type/WALLET_METADATA",
+    "sync/0x?/model_type/WIFI_CREDENTIAL",

[ssid, 2017/01/25 22:24:09]

Do we have a comment in Sync ModelType definitions to update this file if that
is updated?

If not let's remove these from whitelist after our issue is fixed, ie lets see
what model is causing the issue and once fixed, let's not add the model type to
slow reports anymore. Also this would cause lot of extra string comparisons at
each CreateAllocatorDump(). wdyt?

     nullptr  // End of list marker.
 };