Disallow events while reclaiming partition allocator memory (#748)

base/allocator/partition_alloc_support.cc

@@ -49,6 +49,8 @@
 #include "base/allocator/partition_allocator/starscan/stats_reporter.h"
 #endif  // BUILDFLAG(STARSCAN)
 
+#include "base/record_replay.h"
+
 namespace base {
 namespace allocator {
 
@@ -190,6 +192,10 @@ void RunMemoryReclaimer(scoped_refptr<SequencedTaskRunner> task_runner) {
   auto* instance = ::partition_alloc::MemoryReclaimer::Instance();
 
   {
+    // The memory reclaimer runs at consistent points when recording vs. replaying,
+    // but can behave differently.
+    recordreplay::AutoDisallowEvents disallow("RunMemoryReclaimer");
+
     // Micros, since memory reclaiming should typically take at most a few ms.
     SCOPED_UMA_HISTOGRAM_TIMER_MICROS("Memory.PartitionAlloc.MemoryReclaim");
     instance->ReclaimNormal();