Infrastructure for reading V8's initial snapshot from external files

chrome/browser/chrome_content_browser_client.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/chrome_content_browser_client.h"
 
 #include <set>
 #include <utility>
 #include <vector>
 
@@ skipping 2470 matching lines @@
   DCHECK(!app_data_path.empty());
 
   flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
   base::FilePath icudata_path =
       app_data_path.AppendASCII("icudtl.dat");
   base::File icudata_file(icudata_path, flags);
   DCHECK(icudata_file.IsValid());
   mappings->Transfer(kAndroidICUDataDescriptor,
                      base::ScopedFD(icudata_file.TakePlatformFile()));
 
+#ifdef V8_USE_EXTERNAL_STARTUP_DATA
+  base::FilePath v8_data_path;
+  PathService::Get(base::DIR_ANDROID_APP_DATA, &v8_data_path);
+  DCHECK(!v8_data_path.empty());
+
+  int file_flags = base::File::FLAG_OPEN | base::File::FLAG_READ;
+  base::FilePath v8_natives_data_path =
+      v8_data_path.AppendASCII("natives_blob.bin");
+  base::FilePath v8_snapshot_data_path =
+      v8_data_path.AppendASCII("snapshot_blob.bin");
+  base::File v8_natives_data_file(v8_natives_data_path, file_flags);
+  base::File v8_snapshot_data_file(v8_snapshot_data_path, file_flags);
+  DCHECK(v8_natives_data_file.IsValid());
+  DCHECK(v8_snapshot_data_file.IsValid());
+  mappings->Transfer(kV8NativesDataDescriptor,
+                     base::ScopedFD(v8_natives_data_file.TakePlatformFile()));
+  mappings->Transfer(kV8SnapshotDataDescriptor,
+                     base::ScopedFD(v8_snapshot_data_file.TakePlatformFile()));
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
 #else
   int crash_signal_fd = GetCrashSignalFD(command_line);
   if (crash_signal_fd >= 0) {
     mappings->Share(kCrashDumpSignal, crash_signal_fd);
   }
 #endif  // defined(OS_ANDROID)
 }
 #endif  // defined(OS_POSIX) && !defined(OS_MACOSX)
 
 #if defined(OS_WIN)
@@ skipping 133 matching lines @@
       switches::kDisableWebRtcEncryption,
     };
     to_command_line->CopySwitchesFrom(from_command_line,
                                       kWebRtcDevSwitchNames,
                                       arraysize(kWebRtcDevSwitchNames));
   }
 }
 #endif  // defined(ENABLE_WEBRTC)
 
 }  // namespace chrome