From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Attard <samuel.r.attard@gmail.com>
Date: Thu, 18 Oct 2018 17:07:27 -0700
Subject: isolate_holder.patch

Pass pre allocated isolate for initialization, node platform
needs to register on an isolate so that it can be used later
down in the initialization process of an isolate.

Specifically, v8::Isolate::Initialize ends up calling
NodePlatform::GetForegroundTaskRunner, which requires that the
isolate has previously been registered with NodePlatform::RegisterIsolate.
However, if we let gin allocate the isolate, there's no opportunity
for us to register the isolate in between Isolate::Allocate and
Isolate::Initialize.

diff --git a/gin/isolate_holder.cc b/gin/isolate_holder.cc
index 528abd094dd501e462fd197bfd69379e11ba9eaf..5255c1094c88761c19af1ea294ceccaca63b5ae4 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -81,7 +81,8 @@ IsolateHolder::IsolateHolder(
     v8::AddHistogramSampleCallback add_histogram_sample_callback,
     scoped_refptr<base::SingleThreadTaskRunner> user_visible_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> best_effort_task_runner,
-    std::unique_ptr<v8::CppHeap> cpp_heap)
+    std::unique_ptr<v8::CppHeap> cpp_heap,
+    v8::Isolate* isolate)
     : IsolateHolder(std::move(task_runner),
                     access_mode,
                     isolate_type,
@@ -92,7 +93,8 @@ IsolateHolder::IsolateHolder(
                                              std::move(cpp_heap)),
                     isolate_creation_mode,
                     std::move(user_visible_task_runner),
-                    std::move(best_effort_task_runner)) {}
+                    std::move(best_effort_task_runner),
+                    isolate) {}
 
 IsolateHolder::IsolateHolder(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
@@ -101,7 +103,8 @@ IsolateHolder::IsolateHolder(
     std::unique_ptr<v8::Isolate::CreateParams> params,
     IsolateCreationMode isolate_creation_mode,
     scoped_refptr<base::SingleThreadTaskRunner> user_visible_task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> best_effort_task_runner)
+    scoped_refptr<base::SingleThreadTaskRunner> best_effort_task_runner,
+    v8::Isolate* isolate)
     : access_mode_(access_mode), isolate_type_(isolate_type) {
   CHECK(Initialized())
       << "You need to invoke gin::IsolateHolder::Initialize first";
@@ -112,7 +115,7 @@ IsolateHolder::IsolateHolder(
   v8::ArrayBuffer::Allocator* allocator = params->array_buffer_allocator;
   DCHECK(allocator);
 
-  isolate_ = v8::Isolate::Allocate();
+  isolate_ = isolate ? isolate : v8::Isolate::Allocate();
   isolate_data_ = std::make_unique<PerIsolateData>(
       isolate_, allocator, access_mode_, task_runner,
       std::move(user_visible_task_runner), std::move(best_effort_task_runner));
diff --git a/gin/public/isolate_holder.h b/gin/public/isolate_holder.h
index e27f177ce27e177abf6cee84cd466e7a8a829ee7..dc3a5b0678b9c686e241b492e2c3b5ac833611a3 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -88,7 +88,8 @@ class GIN_EXPORT IsolateHolder {
           nullptr,
       scoped_refptr<base::SingleThreadTaskRunner> best_effort_task_runner =
           nullptr,
-      std::unique_ptr<v8::CppHeap> cpp_heap = {});
+      std::unique_ptr<v8::CppHeap> cpp_heap = {},
+      v8::Isolate* isolate = nullptr);
   IsolateHolder(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner,
       AccessMode access_mode,
@@ -98,7 +99,8 @@ class GIN_EXPORT IsolateHolder {
       scoped_refptr<base::SingleThreadTaskRunner> user_visible_task_runner =
           nullptr,
       scoped_refptr<base::SingleThreadTaskRunner> best_effort_task_runner =
-          nullptr);
+          nullptr,
+      v8::Isolate* isolate = nullptr);
   IsolateHolder(const IsolateHolder&) = delete;
   IsolateHolder& operator=(const IsolateHolder&) = delete;
   ~IsolateHolder();
