[Memory] Add system_memory_stats_recorder_win.cc

chrome/browser/memory/system_memory_stats_recorder.h

Index: chrome/browser/memory/system_memory_stats_recorder.h
diff --git a/chrome/browser/memory/system_memory_stats_recorder.h b/chrome/browser/memory/system_memory_stats_recorder.h
index ce406bf79ae89717d069fdd7e90b3b9aa5c1b034..5dc354067575c0779b5be6737eb5ec78ddf8daad 100644
--- a/chrome/browser/memory/system_memory_stats_recorder.h
+++ b/chrome/browser/memory/system_memory_stats_recorder.h
@@ -7,6 +7,10 @@
 
 namespace memory {
 
+// Record a memory size in megabytes, over a potential interval up to 32 GB.
+#define UMA_HISTOGRAM_LARGE_MEMORY_MB(name, sample) \
+  UMA_HISTOGRAM_CUSTOM_COUNTS(name, sample, 1, 32768, 50)
+
 // The type of memory UMA stats to be recorded in RecordMemoryStats.
 enum RecordMemoryStatsType {
   // When a tab was discarded.