Read page-defined hdf vars for sdk from a central file.

Change-Id: I3a38492c5ae44f810a720957291d7e94e1e7d8ea
diff --git a/tools/droiddoc/templates-sdk/sdkpage.cs b/tools/droiddoc/templates-sdk/sdkpage.cs
index 47c2992..9076387 100644
--- a/tools/droiddoc/templates-sdk/sdkpage.cs
+++ b/tools/droiddoc/templates-sdk/sdkpage.cs
@@ -1,5 +1,6 @@
 <?cs include:"doctype.cs" ?>
 <?cs include:"macros.cs" ?>
+<?cs include:"../../../../frameworks/base/docs/html/sdk/sdk_vars.cs" ?>
 <html<?cs if:devsite ?> devsite<?cs /if ?>>
 <?cs if:sdk.redirect ?>
   <head>