[tracing] Introduce BACKGROUND mode in MemoryInfra

components/tracing/child_trace_message_filter_browsertest.cc

Index: components/tracing/child_trace_message_filter_browsertest.cc
diff --git a/components/tracing/child_trace_message_filter_browsertest.cc b/components/tracing/child_trace_message_filter_browsertest.cc
index e73f39202cb9447dcd519d264c40a2ba278b2cf3..ee4d08e447b79aa77a6f1bd1e56d58ad29c303da 100644
--- a/components/tracing/child_trace_message_filter_browsertest.cc
+++ b/components/tracing/child_trace_message_filter_browsertest.cc
@@ -131,7 +131,8 @@ class ChildTracingTest : public content::RenderViewTest, public IPC::Listener {
   // checks that the child actually sends a response to that.
   void RequestProcessMemoryDumpAndCheckResponse(uint64_t dump_guid) {
     SimulateSyntheticMessageFromBrowser(TracingMsg_ProcessMemoryDumpRequest(
-        {dump_guid, MemoryDumpType::EXPLICITLY_TRIGGERED}));
+        {dump_guid, MemoryDumpType::EXPLICITLY_TRIGGERED,
+         MemoryDumpLevelOfDetail::DETAILED}));
 
     // Check that a child -> browser response to the local dump request is sent.
     const IPC::Message* msg =