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 c74b81af691aee95609913519e36498ec578620a..7e1e6ad49ebddb9a4d86789939663b8208d057d5 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -73,7 +73,8 @@ IsolateHolder::IsolateHolder(
     IsolateType isolate_type,
     IsolateCreationMode isolate_creation_mode,
     v8::CreateHistogramCallback create_histogram_callback,
-    v8::AddHistogramSampleCallback add_histogram_sample_callback)
+    v8::AddHistogramSampleCallback add_histogram_sample_callback,
+    v8::Isolate* isolate)
     : IsolateHolder(task_runner,
                     access_mode,
                     isolate_type,
@@ -81,14 +82,16 @@ IsolateHolder::IsolateHolder(
                                              atomics_wait_mode,
                                              create_histogram_callback,
                                              add_histogram_sample_callback),
-                    isolate_creation_mode) {}
+                    isolate_creation_mode,
+                    isolate) {}
 
 IsolateHolder::IsolateHolder(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     AccessMode access_mode,
     IsolateType isolate_type,
     std::unique_ptr<v8::Isolate::CreateParams> params,
-    IsolateCreationMode isolate_creation_mode)
+    IsolateCreationMode isolate_creation_mode,
+    v8::Isolate* isolate)
     : access_mode_(access_mode), isolate_type_(isolate_type) {
   CHECK(Initialized())
       << "You need to invoke gin::IsolateHolder::Initialize first";
@@ -99,7 +102,7 @@ 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);
   //  TODO(https://crbug.com/1347092): Refactor such that caller need not
diff --git a/gin/public/isolate_holder.h b/gin/public/isolate_holder.h
index c9bc6e5dd7e1cf8d198afcd21cbb24970337a50f..688f10fa48511818848f6177a1a20a19ebd54f99 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -83,13 +83,15 @@ class GIN_EXPORT IsolateHolder {
       IsolateType isolate_type,
       IsolateCreationMode isolate_creation_mode = IsolateCreationMode::kNormal,
       v8::CreateHistogramCallback create_histogram_callback = nullptr,
-      v8::AddHistogramSampleCallback add_histogram_sample_callback = nullptr);
+      v8::AddHistogramSampleCallback add_histogram_sample_callback = nullptr,
+      v8::Isolate* isolate = nullptr);
   IsolateHolder(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner,
       AccessMode access_mode,
       IsolateType isolate_type,
       std::unique_ptr<v8::Isolate::CreateParams> params,
-      IsolateCreationMode isolate_creation_mode = IsolateCreationMode::kNormal);
+      IsolateCreationMode isolate_creation_mode = IsolateCreationMode::kNormal,
+      v8::Isolate* isolate = nullptr);
   IsolateHolder(const IsolateHolder&) = delete;
   IsolateHolder& operator=(const IsolateHolder&) = delete;
   ~IsolateHolder();