[WIP] Add SharedMemoryTracker to dump base::SharedMemory usage

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 1eba23b846b8da56377f2c88a9cf37e287325faa..202b71c4c2be8048ba3cfbd33b6cf94a667b5993 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"
@@ -326,8 +327,9 @@ bool SharedMemory::MapAt(off_t offset, size_t bytes) {
       static_cast<uint64_t>(offset) >> 32, static_cast<DWORD>(offset), bytes);
   if (memory_ != NULL) {
     DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(memory_) &
-        (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
+                      (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
     mapped_size_ = GetMemorySectionSize(memory_);
+    SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
     return true;
   }
   return false;
@@ -338,6 +340,7 @@ bool SharedMemory::Unmap() {
     return false;
 
   UnmapViewOfFile(memory_);
+  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
   memory_ = NULL;
   return true;
 }