Run FXJS_V8 embedder tests against a shared isolate.

testing/embedder_test_shared_isolate_delegate.h

+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TESTING_EMBEDDER_TEST_SHARED_ISOLATE_DELEGATE_H_
+#define TESTING_EMBEDDER_TEST_SHARED_ISOLATE_DELEGATE_H_
+
+#include <map>
+#include <utility>
+
+#include "../fpdfsdk/include/jsapi/fxjs_v8.h"
+#include "../third_party/base/nonstd_unique_ptr.h"
+#include "embedder_test.h"
+#include "embedder_test_timer_handling_delegate.h"
+
+class EmbedderTestSharedIsolateDelegate
+    : public EmbedderTestTimerHandlingDelegate {
+ public:
+  EmbedderTestSharedIsolateDelegate()
+      : m_pArrayBufferAllocator(new FXJS_ArrayBufferAllocator) {
+    v8::Isolate::CreateParams params;
+    params.array_buffer_allocator = m_pArrayBufferAllocator.get();
+    m_pIsolate = v8::Isolate::New(params);
+  }
+
+  ~EmbedderTestSharedIsolateDelegate() { m_pIsolate->Dispose(); }
+
+  v8::Isolate* GetSharedIsolate() const override { return m_pIsolate; }
+
+ protected:
+  nonstd::unique_ptr<FXJS_ArrayBufferAllocator> m_pArrayBufferAllocator;
+  v8::Isolate* m_pIsolate;
+};
+
+#endif  // TESTING_EMBEDDER_TEST_SHARED_ISOLATE_DELEGATE_H_