Update the tcmalloc vendor branch to r144 (gperftools 2.0).

third_party/tcmalloc/vendor/src/memory_region_map.cc

Index: third_party/tcmalloc/vendor/src/memory_region_map.cc
diff --git a/third_party/tcmalloc/vendor/src/memory_region_map.cc b/third_party/tcmalloc/vendor/src/memory_region_map.cc
index 3bf8983c4cf55873be3fdeffe0242b9f445b0e10..1a8117248055988d996bd8110e9e18c3a66024db 100644
--- a/third_party/tcmalloc/vendor/src/memory_region_map.cc
+++ b/third_party/tcmalloc/vendor/src/memory_region_map.cc
@@ -122,8 +122,8 @@
 #include "base/low_level_alloc.h"
 #include "malloc_hook-inl.h"
 
-#include <google/stacktrace.h>
-#include <google/malloc_hook.h>
+#include <gperftools/stacktrace.h>
+#include <gperftools/malloc_hook.h>
 
 // MREMAP_FIXED is a linux extension.  How it's used in this file,
 // setting it to 0 is equivalent to saying, "This feature isn't
@@ -145,6 +145,8 @@ SpinLock MemoryRegionMap::owner_lock_(  // ACQUIRED_AFTER(lock_)
     SpinLock::LINKER_INITIALIZED);
 int MemoryRegionMap::recursion_count_ = 0;  // GUARDED_BY(owner_lock_)
 pthread_t MemoryRegionMap::lock_owner_tid_;  // GUARDED_BY(owner_lock_)
+int64 MemoryRegionMap::map_size_ = 0;
+int64 MemoryRegionMap::unmap_size_ = 0;
 
 // ========================================================================= //
 
@@ -462,6 +464,7 @@ void MemoryRegionMap::RecordRegionAddition(const void* start, size_t size) {
               reinterpret_cast<void*>(region.caller()));
   // Note: none of the above allocates memory.
   Lock();  // recursively lock
+  map_size_ += size;
   InsertRegionLocked(region);
     // This will (eventually) allocate storage for and copy over the stack data
     // from region.call_stack_data_ that is pointed by region.call_stack().
@@ -573,6 +576,7 @@ void MemoryRegionMap::RecordRegionRemoval(const void* start, size_t size) {
               reinterpret_cast<void*>(end_addr),
               regions_->size());
   if (VLOG_IS_ON(12))  LogAllLocked();
+  unmap_size_ += size;
   Unlock();
 }