Add Ignition to about:flags.

chrome/renderer/chrome_render_process_observer.cc

Index: chrome/renderer/chrome_render_process_observer.cc
diff --git a/chrome/renderer/chrome_render_process_observer.cc b/chrome/renderer/chrome_render_process_observer.cc
index e8daff7e736b2f2bfc706b243a9f9d2a802cfc1a..dc737b8e9a07341de575c1c6a0f3b9a7d998067d 100644
--- a/chrome/renderer/chrome_render_process_observer.cc
+++ b/chrome/renderer/chrome_render_process_observer.cc
@@ -256,6 +256,11 @@ ChromeRenderProcessObserver::ChromeRenderProcessObserver()
     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()));