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 f07c487e4e52667c9df5b5218d768752309b6b0b..f97cd70afc3b22d9cb4f2afe1a07f375661456ca 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -336,14 +336,14 @@ 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
@@ -558,6 +558,12 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // The memory allocator, if any, in which the renderer will write its metrics.
   std::unique_ptr<base::SharedPersistentMemoryAllocator> metrics_allocator_;
 
+  // Anonymous shared memory segment to share with subprocess containing list of
+  // field trials (represented as a string).
+  // TODO(crbug.com/653874): Eventually remove this and use single shared memory
+  // object across processes.
+  std::unique_ptr<base::SharedMemory> field_trial_state_;
+
   bool channel_connected_;
   bool sent_render_process_ready_;