docs: Add page TOC logic for ARC

b/30114799

Change-Id: I13eb222d575049fdee56e571d18e2940c94f52f8
(cherry picked from commit 6340c7d42314b17b9c7d8788b4d28d9499f6cdde)
diff --git a/src/com/google/doclava/DocFile.java b/src/com/google/doclava/DocFile.java
index 8048c47..0972de6 100644
--- a/src/com/google/doclava/DocFile.java
+++ b/src/com/google/doclava/DocFile.java
@@ -241,6 +241,10 @@
             hdf.setValue("perf", "true");
             hdf.setValue("page.type", "develop");
             hdf.setValue("page.category", "performance");
+          } else if (filename.indexOf("topic/arc") == 0) {
+            hdf.setValue("arc", "true");
+            hdf.setValue("page.type", "develop");
+            hdf.setValue("page.category", "arc");
           }
         } else if (filename.indexOf("distribute") == 0) {
           hdf.setValue("distribute", "true");
@@ -432,6 +436,10 @@
             hdf.setValue("perf", "true");
             hdf.setValue("page.type", "develop");
             hdf.setValue("page.category", "performance");
+          } else if (filename.indexOf("topic/arc") == 0) {
+            hdf.setValue("arc", "true");
+            hdf.setValue("page.type", "develop");
+            hdf.setValue("page.category", "arc");
           }
         } else if (filename.indexOf("wear/preview") == 0) {
           hdf.setValue("wearpreview", "true");