Infrastructure for reading V8's initial snapshot from external files

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index e6556154ee1bca31f7a0adcc65a8c7172a3ae66b..8871cc316c9a0317c209bfce608c08724bbcdebf 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -11,6 +11,9 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
+#if defined(V8_USE_EXTERNAL_STARTUP_DATA) && defined(OS_MACOSX)
+#include "base/mac/bundle_locations.h"
+#endif

[rmcilroy, 2014/09/23 10:04:20]

I don't think you need this here?

[baixo, 2014/09/23 11:36:46]

Done.

 #include "base/path_service.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ -2449,6 +2452,26 @@ void ChromeContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
   mappings->push_back(FileDescriptorInfo(kAndroidICUDataDescriptor,
                                          FileDescriptor(icudata_file.Pass())));
 
+#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->push_back(FileDescriptorInfo(kV8NativesDataDescriptor,
+      FileDescriptor(v8_natives_data_file.Pass())));
+  mappings->push_back(FileDescriptorInfo(kV8SnapshotDataDescriptor,
+      FileDescriptor(v8_snapshot_data_file.Pass())));
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
 #else
   int crash_signal_fd = GetCrashSignalFD(command_line);
   if (crash_signal_fd >= 0) {