Consolidate all TDI SiteInstances into one render process.

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 045236328b33c1af721ccd1326aa1a2303dd617f..064d15b54de390bf3794e4ab86cf83f954b744f3 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -174,6 +174,8 @@ class CONTENT_EXPORT RenderProcessHostImpl
   void PurgeAndSuspend() override;
   void Resume() override;
   mojom::Renderer* GetRendererInterface() override;
+  void SetIsNeverSuitableForReuse() override;
+  bool MayReuseHost() override;
 
   mojom::RouteProvider* GetRemoteRouteProvider();
 
@@ -437,6 +439,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // longer be modified.
   bool is_worker_ref_count_disabled_;
 
+  // Whether this host is never suitable for reuse as determined in the
+  // MayReuseHost() function.
+  bool is_never_suitable_for_reuse_ = false;
+
   // The registered IPC listener objects. When this list is empty, we should
   // delete ourselves.
   IDMap<IPC::Listener*> listeners_;