memory-infra: Move dump level check to observer and rename session state

base/trace_event/process_memory_dump.cc

Index: base/trace_event/process_memory_dump.cc
diff --git a/base/trace_event/process_memory_dump.cc b/base/trace_event/process_memory_dump.cc
index da7bcad0959f9e782d59409b6e5e975fd23d0bc6..0a2bf66620f4a173dd6e34269db614cf85e1d02e 100644
--- a/base/trace_event/process_memory_dump.cc
+++ b/base/trace_event/process_memory_dump.cc
@@ -12,6 +12,7 @@
 #include "base/process/process_metrics.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/heap_profiler_heap_dump_writer.h"
+#include "base/trace_event/heap_profiler_serialization_state.h"
 #include "base/trace_event/memory_infra_background_whitelist.h"
 #include "base/trace_event/process_memory_totals.h"
 #include "base/trace_event/trace_event_argument.h"
@@ -151,11 +152,13 @@ size_t ProcessMemoryDump::CountResidentBytes(void* start_address,
 #endif  // defined(COUNT_RESIDENT_BYTES_SUPPORTED)
 
 ProcessMemoryDump::ProcessMemoryDump(
-    scoped_refptr<MemoryDumpSessionState> session_state,
+    scoped_refptr<HeapProfilerSerializationState>
+        heap_profiler_serialization_state,
     const MemoryDumpArgs& dump_args)
     : has_process_totals_(false),
       has_process_mmaps_(false),
-      session_state_(std::move(session_state)),
+      heap_profiler_serialization_state_(
+          std::move(heap_profiler_serialization_state)),
       dump_args_(dump_args) {}
 
 ProcessMemoryDump::~ProcessMemoryDump() {}
@@ -252,7 +255,7 @@ void ProcessMemoryDump::DumpHeapUsage(
   if (!metrics_by_context.empty()) {
     DCHECK_EQ(0ul, heap_dumps_.count(allocator_name));
     std::unique_ptr<TracedValue> heap_dump = ExportHeapDump(
-        metrics_by_context, *session_state());
+        metrics_by_context, *heap_profiler_serialization_state());
     heap_dumps_[allocator_name] = std::move(heap_dump);
   }