Support Turbine in Soong.

If sdk jars(android_stubs_current, etc) are compiled using soong java
modules, we have to filter them when running Java build with Turbine.

TODO: provide more unit-tests.

Test: m clean && m -j32; go test java_test

Change-Id: Iad7c241b0e8b0ca760950733f513124b56c84564

android/testing.go

@@ -95,6 +95,15 @@ func (m TestingModule) Rule(rule string) ModuleBuildParams {
 	panic(fmt.Errorf("couldn't find rule %q", rule))
 }
 
+func (m TestingModule) Description(desc string) ModuleBuildParams {
+	for _, p := range m.module.BuildParamsForTests() {
+		if p.Description == desc {
+			return p
+		}
+	}
+	panic(fmt.Errorf("couldn't find description %q", desc))
+}
+
 func (m TestingModule) Output(file string) ModuleBuildParams {
 	for _, p := range m.module.BuildParamsForTests() {
 		outputs := append(WritablePaths(nil), p.Outputs...)