binding: Makes assertion of adjustAmountOfExternalAllocatedMemory more exact.

third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 341 matching lines @@
     return data;
   }
 
   void Free(void* data, size_t size) override {
     WTF::ArrayBufferContents::freeMemory(data, size);
   }
 };
 
 }  // namespace
 
-static void adjustAmountOfExternalAllocatedMemory(int64_t size) {
+static void adjustAmountOfExternalAllocatedMemory(int64_t diff) {
 #if ENABLE(ASSERT)
-  static int64_t totalSize = 0;
-  totalSize += size;
-  DCHECK_GE(totalSize, 0);
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(int64_t, processTotal, new int64_t(0));
+  DEFINE_THREAD_SAFE_STATIC_LOCAL(Mutex, mutex, new Mutex);
+  {
+    MutexLocker locker(mutex);
+
+    processTotal += diff;
+    DCHECK_GE(processTotal, 0) << "total amount = " << processTotal
+                               << ", diff = " << diff;
+  }
 #endif
 
-  v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(size);
+  v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(diff);
 }
 
 void V8Initializer::initializeMainThread() {
   ASSERT(isMainThread());
 
   WTF::ArrayBufferContents::initialize(adjustAmountOfExternalAllocatedMemory);
 
   DEFINE_STATIC_LOCAL(ArrayBufferAllocator, arrayBufferAllocator, ());
   auto v8ExtrasMode = RuntimeEnabledFeatures::experimentalV8ExtrasEnabled()
                           ? gin::IsolateHolder::kStableAndExperimentalV8Extras
@@ skipping 106 matching lines @@
   isolate->AddMessageListener(messageHandlerInWorker);
   isolate->SetFatalErrorHandler(reportFatalErrorInWorker);
 
   uint32_t here;
   isolate->SetStackLimit(reinterpret_cast<uintptr_t>(
       &here - kWorkerMaxStackSize / sizeof(uint32_t*)));
   isolate->SetPromiseRejectCallback(promiseRejectHandlerInWorker);
 }
 
 }  // namespace blink