Infrastructure for reading V8's initial snapshot from external files

gin/test/v8_test.cc

Index: gin/test/v8_test.cc
diff --git a/gin/test/v8_test.cc b/gin/test/v8_test.cc
index cb6d57374762e0199cb0ac795bed068f3f52d7f5..a02251128a2c1bd13f776e1ca7b6a6fe405749eb 100644
--- a/gin/test/v8_test.cc
+++ b/gin/test/v8_test.cc
@@ -7,6 +7,10 @@
 #include "gin/array_buffer.h"
 #include "gin/public/isolate_holder.h"
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "gin/public/isolate_holder.h"
+#endif
+
 using v8::Context;
 using v8::Local;
 using v8::HandleScope;
@@ -20,6 +24,9 @@ V8Test::~V8Test() {
 }
 
 void V8Test::SetUp() {
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  gin::IsolateHolder::LoadV8Snapshot();
+#endif
   gin::IsolateHolder::Initialize(gin::IsolateHolder::kStrictMode,
                                  gin::ArrayBufferAllocator::SharedInstance());
   instance_.reset(new gin::IsolateHolder);