Use command line to signal whether a child process was passed V8 snapshot files via file descriptor

chromecast/browser/cast_content_browser_client.cc

 // Copyright 2014 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 "chromecast/browser/cast_content_browser_client.h"
 
 #include <string>
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
@@ skipping 116 matching lines @@
 
 void CastContentBrowserClient::AppendExtraCommandLineSwitches(
     base::CommandLine* command_line,
     int child_process_id) {
 
   std::string process_type =
       command_line->GetSwitchValueNative(switches::kProcessType);
   base::CommandLine* browser_command_line =
       base::CommandLine::ForCurrentProcess();
 
+#if defined(V8_USE_EXTERNAL_STARTUP_DATA)
+  if (process_type != switches::kZygoteProcess) {
+    command_line->AppendSwitch(::switches::kV8NativesPassedByFD);
+    command_line->AppendSwitch(::switches::kV8SnapshotPassedByFD);
+  }
+#endif  // V8_USE_EXTERNAL_STARTUP_DATA
+
   // IsCrashReporterEnabled() is set when InitCrashReporter() is called, and
   // controlled by GetBreakpadClient()->EnableBreakpadForProcess(), therefore
   // it's ok to add switch to every process here.
   if (breakpad::IsCrashReporterEnabled()) {
     command_line->AppendSwitch(switches::kEnableCrashReporter);
   }
 
   // Renderer process command-line
   if (process_type == switches::kRendererProcess) {
     // Any browser command-line switches that should be propagated to
@@ skipping 238 matching lines @@
         process_type, dumps_path, false /* upload */);
   // StartUploaderThread() even though upload is diferred.
   // Breakpad-related memory is freed in the uploader thread.
   crash_handler->StartUploaderThread();
   return crash_handler;
 }
 #endif  // !defined(OS_ANDROID)
 
 }  // namespace shell
 }  // namespace chromecast