Update from https://crrev.com/311076

gin/public/isolate_holder.h

Index: gin/public/isolate_holder.h
diff --git a/gin/public/isolate_holder.h b/gin/public/isolate_holder.h
index b12734c4413c377ebcd6318b41fddd2b3ba721dd..44d1d89a7a164dc99fbeffae7fd0cc5b0909c3e2 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -33,7 +33,7 @@ class GIN_EXPORT IsolateHolder {
   // Should be invoked once before creating IsolateHolder instances to
   // initialize V8 and Gin. In case V8_USE_EXTERNAL_STARTUP_DATA is defined,
   // V8's initial snapshot should be loaded (by calling LoadV8Snapshot or
-  // LoadV8SnapshotFD) before calling Initialize.
+  // LoadV8SnapshotFd) before calling Initialize.
   static void Initialize(ScriptMode mode,
                          v8::ArrayBuffer::Allocator* allocator);
 
@@ -51,8 +51,16 @@ class GIN_EXPORT IsolateHolder {
   // thread.
   void RemoveRunMicrotasksObserver();
 
-#ifdef V8_USE_EXTERNAL_STARTUP_DATA
-  static bool LoadV8SnapshotFD(int natives_fd, int snapshot_fd);
+#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
+  static const char kNativesFileName[];
+  static const char kSnapshotFileName[];
+
+  static bool LoadV8SnapshotFd(int natives_fd,
+                               int64 natives_offset,
+                               int64 natives_size,
+                               int snapshot_fd,
+                               int64 snapshot_offset,
+                               int64 snapshot_size);
   static bool LoadV8Snapshot();
 #endif  // V8_USE_EXTERNAL_STARTUP_DATA
   static void GetV8ExternalSnapshotData(const char** natives_data_out,