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

base/memory/shared_memory_nacl.cc

Index: base/memory/shared_memory_nacl.cc
diff --git a/base/memory/shared_memory_nacl.cc b/base/memory/shared_memory_nacl.cc
index 945fc61375a901187ced95dbc5ece779e479c4cf..a91d3856dbc2c5c844c81a228ad8ffc650b755b5 100644
--- a/base/memory/shared_memory_nacl.cc
+++ b/base/memory/shared_memory_nacl.cc
@@ -14,6 +14,7 @@
 #include <limits>
 
 #include "base/logging.h"
+#include "base/memory/shared_memory_tracker.h"
 
 namespace base {
 
@@ -99,7 +100,8 @@ bool SharedMemory::MapAt(off_t offset, size_t bytes) {
   if (mmap_succeeded) {
     mapped_size_ = bytes;
     DCHECK_EQ(0U, reinterpret_cast<uintptr_t>(memory_) &
-        (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
+                      (SharedMemory::MAP_MINIMUM_ALIGNMENT - 1));
+    SharedMemoryTracker::GetInstance()->IncrementMemoryUsage(*this);
   } else {
     memory_ = NULL;
   }
@@ -113,6 +115,7 @@ bool SharedMemory::Unmap() {
 
   if (munmap(memory_, mapped_size_) < 0)
     DPLOG(ERROR) << "munmap";
+  SharedMemoryTracker::GetInstance()->DecrementMemoryUsage(*this);
   memory_ = NULL;
   mapped_size_ = 0;
   return true;