Add .hjar output file tag

Allow genrules to access the turbine header jar outputs
from java_library modules using the .hjar output file
tag.

Bug: 251871740
Test: m checkbuild
Change-Id: Ib1ec9734323a51583057fb458f791e1e0bd0d767
diff --git a/java/base.go b/java/base.go
index 96f36e8..602e8d8 100644
--- a/java/base.go
+++ b/java/base.go
@@ -593,6 +593,8 @@
 		return android.Paths{j.outputFile}, nil
 	case ".jar":
 		return android.Paths{j.implementationAndResourcesJar}, nil
+	case ".hjar":
+		return android.Paths{j.headerJarFile}, nil
 	case ".proguard_map":
 		if j.dexer.proguardDictionary.Valid() {
 			return android.Paths{j.dexer.proguardDictionary.Path()}, nil