Improve TDI render process naming in the task manager.

content/public/browser/site_instance.h

Index: content/public/browser/site_instance.h
diff --git a/content/public/browser/site_instance.h b/content/public/browser/site_instance.h
index 708da824c2951d4ccfd64de1e7c9410b77fe9a98..2d1a9a3dbca452b0964bcfe8c70225192839f595 100644
--- a/content/public/browser/site_instance.h
+++ b/content/public/browser/site_instance.h
@@ -130,6 +130,11 @@ class CONTENT_EXPORT SiteInstance : public base::RefCounted<SiteInstance> {
   // process. This only returns true under the "site per process" process model.
   virtual bool RequiresDedicatedProcess() = 0;
 
+  // Returns true if this SiteInstance is used as the default SiteInstance for
+  // cross-site subframes. This only returns true if "top document isolation" is
+  // used.
+  virtual bool IsDefaultSubframeSiteInstance() const = 0;
+
   // Factory method to create a new SiteInstance.  This will create a new
   // new BrowsingInstance, so it should only be used when creating a new tab
   // from scratch (or similar circumstances).