Revert of [DevTools] Consolidate overlay-related functionality in Overlay domain

headless/public/headless_devtools_client.h

Index: headless/public/headless_devtools_client.h
diff --git a/headless/public/headless_devtools_client.h b/headless/public/headless_devtools_client.h
index b3cea9482c32724c35fce69f4c58ead0b38495e3..7e7d97982c5c02bda5a925cf7be8a455384f90e9 100644
--- a/headless/public/headless_devtools_client.h
+++ b/headless/public/headless_devtools_client.h
@@ -84,6 +84,9 @@
 namespace profiler {
 class Domain;
 }
+namespace rendering {
+class Domain;
+}
 namespace runtime {
 class Domain;
 }
@@ -136,6 +139,7 @@
   virtual network::Domain* GetNetwork() = 0;
   virtual page::Domain* GetPage() = 0;
   virtual profiler::Domain* GetProfiler() = 0;
+  virtual rendering::Domain* GetRendering() = 0;
   virtual runtime::Domain* GetRuntime() = 0;
   virtual security::Domain* GetSecurity() = 0;
   virtual service_worker::Domain* GetServiceWorker() = 0;