Expose a lower bound of malloc'd memory via heap statistics

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 if (is_android) {
@@ skipping 1730 matching lines @@
   if (v8_postmortem_support) {
     sources += [ "$target_gen_dir/debug-support.cc" ]
     deps += [ ":postmortem-metadata" ]
   }
 }
 
 source_set("v8_libbase") {
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
   sources = [
+    "src/base/accounting-allocator.cc",
+    "src/base/accounting-allocator.h",
     "src/base/adapters.h",
     "src/base/atomicops.h",
     "src/base/atomicops_internals_arm64_gcc.h",
     "src/base/atomicops_internals_arm_gcc.h",
     "src/base/atomicops_internals_atomicword_compat.h",
     "src/base/atomicops_internals_mac.h",
     "src/base/atomicops_internals_mips64_gcc.h",
     "src/base/atomicops_internals_mips_gcc.h",
     "src/base/atomicops_internals_portable.h",
     "src/base/atomicops_internals_s390_gcc.h",
@@ skipping 352 matching lines @@
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
   configs += [
     ":internal_config",
     ":libplatform_config",
     ":features",
     ":toolchain",
   ]
 }