Revert "java_sdk_library: Do not expose stubs implementation jar"

Revert submission 11569833

Reason for revert:  Broke presubmit: b/157231582
Reverted Changes:
Ia99def91e:Improve tracking of exported sdk libraries
If91b4d106:java_sdk_library: Do not expose stubs implementati...
Id6d76e56c:java_sdk_library: Access outputs using tags

Change-Id: I87e459d45ee97e284a9d966d5446305f80627175
diff --git a/java/sdk_library.go b/java/sdk_library.go
index 5efb4d0..684a002 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -694,7 +694,7 @@
 	return nil
 }
 
-func (c *commonToSdkLibraryAndImport) selectHeaderJarsForSdkVersion(ctx android.BaseModuleContext, sdkVersion sdkSpec) android.Paths {
+func (c *commonToSdkLibraryAndImport) sdkJarsCommon(ctx android.BaseModuleContext, sdkVersion sdkSpec, headerJars bool) android.Paths {
 
 	// If a specific numeric version has been requested then use prebuilt versions of the sdk.
 	if sdkVersion.version.isNumbered() {
@@ -725,7 +725,11 @@
 		return nil
 	}
 
-	return paths.stubsHeaderPath
+	if headerJars {
+		return paths.stubsHeaderPath
+	} else {
+		return paths.stubsImplPath
+	}
 }
 
 type SdkLibrary struct {
@@ -1196,7 +1200,7 @@
 		return module.HeaderJars()
 	}
 
-	return module.selectHeaderJarsForSdkVersion(ctx, sdkVersion)
+	return module.sdkJarsCommon(ctx, sdkVersion, headerJars)
 }
 
 // to satisfy SdkLibraryDependency interface
@@ -1635,7 +1639,11 @@
 }
 
 func (module *sdkLibraryImport) sdkJars(ctx android.BaseModuleContext, sdkVersion sdkSpec) android.Paths {
-	return module.selectHeaderJarsForSdkVersion(ctx, sdkVersion)
+
+	// The java_sdk_library_import can only ever give back header jars as it does not
+	// have an implementation jar.
+	headerJars := true
+	return module.sdkJarsCommon(ctx, sdkVersion, headerJars)
 }
 
 // to satisfy SdkLibraryDependency interface