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 6268851494a0bbc0b3e693782dae6171f6347657..87ae3db7aec96577856804aa3718e53e3ccf66d3 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -72,7 +72,8 @@ 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,
@@ -80,14 +81,16 @@ 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";
@@ -98,7 +101,7 @@ 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 12ddcc30397a02df78727f16a02b8e81fd1d9c8e..6629c29328354c911679fc6bb2af982611ecce10 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();