Add Ignition to about:flags.

chrome/renderer/chrome_render_process_observer.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/renderer/chrome_render_process_observer.h"
 
 #include <stddef.h>
 #include <limits>
 #include <set>
 #include <utility>
@@ skipping 238 matching lines @@
   if (command_line.HasSwitch(switches::kDisableJavaScriptHarmonyShipping)) {
     std::string flag("--noharmony-shipping");
     v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));
   }
 
   if (command_line.HasSwitch(switches::kJavaScriptHarmony)) {
     std::string flag("--harmony");
     v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));
   }
 
+  if (command_line.HasSwitch(switches::kEnableIgnition)) {
+    std::string flag("--ignition");
+    v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));

[jochen (gone - plz use gerrit), 2016/03/24 14:43:41]

the proxy and pdfium will run without ignition then, is that what you intend to
do?

[rmcilroy, 2016/03/24 15:46:47]

I'm not too worried about this being used for proxy PAC files, but it might be
nice to enable it for pdfium. Could you recommend the best place to set this
flag for pdfium?

+  }
+
   if (command_line.HasSwitch(switches::kEnableWasm)) {
     std::string flag("--expose-wasm");
     v8::V8::SetFlagsFromString(flag.c_str(), static_cast<int>(flag.size()));
   }
 
   RenderThread* thread = RenderThread::Get();
   resource_delegate_.reset(new RendererResourceDelegate());
   thread->SetResourceDispatcherDelegate(resource_delegate_.get());
 
   thread->GetServiceRegistry()->AddService<ResourceUsageReporter>(
@@ skipping 121 matching lines @@
 ChromeRenderProcessObserver::content_setting_rules() const {
   return &content_setting_rules_;
 }
 
 void ChromeRenderProcessObserver::OnFieldTrialGroupFinalized(
     const std::string& trial_name,
     const std::string& group_name) {
   content::RenderThread::Get()->Send(
       new ChromeViewHostMsg_FieldTrialActivated(trial_name));
 }