Consolidate all TDI SiteInstances into one render process.

content/public/browser/render_process_host.h

Index: content/public/browser/render_process_host.h
diff --git a/content/public/browser/render_process_host.h b/content/public/browser/render_process_host.h
index 0477aa0861a93089e96c08a770ec8c847883d5e1..67c532163fa2c78f3ddc60d9de880e7dbe955bee 100644
--- a/content/public/browser/render_process_host.h
+++ b/content/public/browser/render_process_host.h
@@ -348,6 +348,11 @@ class CONTENT_EXPORT RenderProcessHost : public IPC::Sender,
   // MockRenderProcessHost usage in tests.
   virtual mojom::Renderer* GetRendererInterface() = 0;
 
+  // Whether this process is locked out from ever being reused for sites other
+  // than the ones it currently has.
+  virtual void SetIsNeverSuitableForReuse() = 0;
+  virtual bool MayReuseHost() = 0;
+
   // Returns the current number of active views in this process.  Excludes
   // any RenderViewHosts that are swapped out.
   size_t GetActiveViewCount();