Change roots view to "rooted".

Instead of just showing roots in the roots view, show all objects
whose immediate dominator is the SENTINEL_ROOT.

Bug: 24613815
Change-Id: I96429d75395edfe109222e88d31cdc0bd87a7767
diff --git a/tools/ahat/src/Main.java b/tools/ahat/src/Main.java
index 96fc53b..ebd49d7 100644
--- a/tools/ahat/src/Main.java
+++ b/tools/ahat/src/Main.java
@@ -74,7 +74,7 @@
     InetSocketAddress addr = new InetSocketAddress(loopback, port);
     HttpServer server = HttpServer.create(addr, 0);
     server.createContext("/", new AhatHttpHandler(new OverviewHandler(ahat, hprof)));
-    server.createContext("/roots", new AhatHttpHandler(new RootsHandler(ahat)));
+    server.createContext("/rooted", new AhatHttpHandler(new RootedHandler(ahat)));
     server.createContext("/object", new AhatHttpHandler(new ObjectHandler(ahat)));
     server.createContext("/objects", new AhatHttpHandler(new ObjectsHandler(ahat)));
     server.createContext("/site", new AhatHttpHandler(new SiteHandler(ahat)));