Infrastructure for reading V8's initial snapshot from external files

gin/public/isolate_holder.h

 // Copyright 2013 The Chromium 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 GIN_PUBLIC_ISOLATE_HOLDER_H_
 #define GIN_PUBLIC_ISOLATE_HOLDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "gin/gin_export.h"
 #include "v8/include/v8.h"
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#include "base/files/memory_mapped_file.h"
+#endif
+
 namespace gin {
 
 class PerIsolateData;
 class RunMicrotasksObserver;
 
 // To embed Gin, first initialize gin using IsolateHolder::Initialize and then
 // create an instance of IsolateHolder to hold the v8::Isolate in which you
 // will execute JavaScript. You might wish to subclass IsolateHolder if you
 // want to tie more state to the lifetime of the isolate.
 class GIN_EXPORT IsolateHolder {
@@ skipping 19 matching lines @@
   // loop. This method adds a MessageLoop TaskObserver which runs any pending
   // Microtasks each time a Task is completed. This method should be called
   // once, when a MessageLoop is created and it should be called on the
   // MessageLoop's thread.
   void AddRunMicrotasksObserver();
 
   // This method should also only be called once, and on the MessageLoop's
   // thread.
   void RemoveRunMicrotasksObserver();
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+#ifdef OS_ANDROID
+  static bool LoadV8SnapshotFD(int natives_fd, int snapshot_fd);
+#endif
+  static bool LoadV8Snapshot();
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
  private:
   v8::Isolate* isolate_;
   scoped_ptr<PerIsolateData> isolate_data_;
   scoped_ptr<RunMicrotasksObserver> task_observer_;
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+
+  static bool MapV8Files(
+    base::FilePath* natives_path, base::FilePath* snapshot_path,
+    int natives = -1, int snapshot = -1);
+
+#endif // V8_USE_EXTERNAL_STARTUP_DATA
+
   DISALLOW_COPY_AND_ASSIGN(IsolateHolder);
 };
 
 }  // namespace gin
 
 #endif  // GIN_PUBLIC_ISOLATE_HOLDER_H_