Recode shared memory usage on Windows, macOS and NaCl

base/memory/shared_memory_win.cc

Index: base/memory/shared_memory_win.cc
diff --git a/base/memory/shared_memory_win.cc b/base/memory/shared_memory_win.cc
index 3839f447abb3f98f4b6347ee32ba35f601d29604..83a5b5100433a959f8fc3e8575210940a0ab662f 100644
--- a/base/memory/shared_memory_win.cc
+++ b/base/memory/shared_memory_win.cc
@@ -9,6 +9,7 @@
 #include <stdint.h>
 
 #include "base/logging.h"
+#include "base/memory/shared_memory_tracker.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
 #include "base/strings/stringprintf.h"
@@ -309,6 +310,7 @@ bool SharedMemory::MapAt(off_t offset, size_t bytes) {
     DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(memory_) &
         (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
     mapped_size_ = GetMemorySectionSize(memory_);
+    SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
     return true;
   }
   return false;
@@ -318,6 +320,7 @@ bool SharedMemory::Unmap() {
   if (memory_ == NULL)
     return false;
 
+  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
   UnmapViewOfFile(memory_);
   memory_ = NULL;
   return true;