Merge changes I5b4e5570,I1de4b322

* changes:
  Add an api_files property in java_api_library
  Use relaxed check for prebuilt src
diff --git a/cc/library_stub.go b/cc/library_stub.go
index c61e2d1..d21df51 100644
--- a/cc/library_stub.go
+++ b/cc/library_stub.go
@@ -148,8 +148,9 @@
 
 	var in android.Path
 
+	// src might not exist during the beginning of soong analysis in Multi-tree
 	if src := String(d.properties.Src); src != "" {
-		in = android.PathForModuleSrc(ctx, src)
+		in = android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), src)
 	}
 
 	// LLNDK variant
diff --git a/java/java.go b/java/java.go
index e37a77e..9dd5850 100644
--- a/java/java.go
+++ b/java/java.go
@@ -1567,8 +1567,14 @@
 	Api_surface *string
 
 	// list of Java API contribution modules that consists this API surface
+	// This is a list of Soong modules
 	Api_contributions []string
 
+	// list of api.txt files relative to this directory that contribute to the
+	// API surface.
+	// This is a list of relative paths
+	Api_files []string
+
 	// List of flags to be passed to the javac compiler to generate jar file
 	Javacflags []string
 }
@@ -1665,6 +1671,13 @@
 		srcFiles = append(srcFiles, android.PathForSource(ctx, provider.ApiFile.String()))
 	})
 
+	// Add the api_files inputs
+	for _, api := range al.properties.Api_files {
+		// Use MaybeExistentPathForSource since the api file might not exist during analysis.
+		// This will be provided by the orchestrator in the combined execution.
+		srcFiles = append(srcFiles, android.MaybeExistentPathForSource(ctx, ctx.ModuleDir(), api))
+	}
+
 	cmd := metalavaStubCmd(ctx, rule, srcFiles, homeDir)
 
 	al.stubsFlags(ctx, cmd, stubsDir)
diff --git a/java/java_test.go b/java/java_test.go
index ff15783..dff1fd0 100644
--- a/java/java_test.go
+++ b/java/java_test.go
@@ -1863,6 +1863,7 @@
 			name: "bar2",
 			api_surface: "system",
 			api_contributions: ["foo1", "foo2"],
+			api_files: ["api1/current.txt", "api2/current.txt"]
 		}
 		`,
 		map[string][]byte{
@@ -1880,7 +1881,7 @@
 		},
 		{
 			moduleName:         "bar2",
-			sourceTextFileDirs: []string{"a/foo1.txt", "b/foo2.txt"},
+			sourceTextFileDirs: []string{"a/foo1.txt", "b/foo2.txt", "api1/current.txt", "api2/current.txt"},
 		},
 	}
 	for _, c := range testcases {