Initial implementation for sharing field trial state (win)

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index aac8afa60c469e67337e8ded3fe2a9e2d5abfcf8..700fbb57a1b6ee1cd722007e05e361c270ddbe3a 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -356,14 +356,14 @@ class CONTENT_EXPORT RenderProcessHostImpl
 
   // Generates a command line to be used to spawn a renderer and appends the
   // results to |*command_line|.
-  void AppendRendererCommandLine(base::CommandLine* command_line) const;
+  void AppendRendererCommandLine(base::CommandLine* command_line);
 
   // Copies applicable command line switches from the given |browser_cmd| line
   // flags to the output |renderer_cmd| line flags. Not all switches will be
   // copied over.
   void PropagateBrowserCommandLineToRenderer(
       const base::CommandLine& browser_cmd,
-      base::CommandLine* renderer_cmd) const;
+      base::CommandLine* renderer_cmd);
 
   // Inspects the current object state and sets/removes background priority if
   // appropriate. Should be called after any of the involved data members
@@ -587,6 +587,8 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // The memory allocator, if any, in which the renderer will write its metrics.
   std::unique_ptr<base::SharedPersistentMemoryAllocator> metrics_allocator_;
 
+  std::unique_ptr<base::SharedMemory> field_trial_state_;

[Alexei Svitkine (slow), 2016/10/03 15:28:05]

Add a comment and document lifetime of this. Add a TODO to use the same shared
state between processes.

[lawrencewu, 2016/10/03 21:36:11]

Done.

+
   bool channel_connected_;
   bool sent_render_process_ready_;