deps: V8: cherry-pick d3308d0

Original commit message:

    [api] Add `Isolate::GetArrayBufferAllocator()`

    This allows non-monolithic embedders to always allocate memory
    for ArrayBuffer instances using the right allocation method.

    This is based on a patch that Electron is currently using.

    Refs: https://github.com/electron/electron/blob/1898f9162073910c05958295c612deec6121a892/patches/common/v8/array_buffer.patch
    Change-Id: I39a614343118a0594aab48699a99cc2aad5b7ba9
    Reviewed-on: https://chromium-review.googlesource.com/c/1462003
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Commit-Queue: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#59697}

Refs: v8/v8@d3308d0

PR-URL: #25852
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>

common.gypi

@@ -37,7 +37,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.2',
+    'v8_embedder_string': '-node.3',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/include/v8.h

@@ -7700,6 +7700,9 @@ class V8_EXPORT Isolate {
    */
   void SetIdle(bool is_idle);
 
+  /** Returns the ArrayBuffer::Allocator used in this isolate. */
+  ArrayBuffer::Allocator* GetArrayBufferAllocator();
+
   /** Returns true if this isolate has a current context. */
   bool InContext();
 

deps/v8/src/api.cc

@@ -7970,6 +7970,11 @@ void Isolate::SetIdle(bool is_idle) {
   isolate->SetIdle(is_idle);
 }
 
+ArrayBuffer::Allocator* Isolate::GetArrayBufferAllocator() {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  return isolate->array_buffer_allocator();
+}
+
 bool Isolate::InContext() {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   return !isolate->context().is_null();

deps/v8/test/cctest/test-api.cc

@@ -20620,6 +20620,7 @@ TEST(IsolateNewDispose) {
   CHECK_NOT_NULL(isolate);
   CHECK(current_isolate != isolate);
   CHECK(current_isolate == CcTest::isolate());
+  CHECK(isolate->GetArrayBufferAllocator() == CcTest::array_buffer_allocator());
 
   isolate->SetFatalErrorHandler(StoringErrorCallback);
   last_location = last_message = nullptr;