Add "test-only" flag for java modules

As part of aosp/3022586 where we added the idea of "test-only" modules
and top_level_test_targets, this CL implements that for java modules.

We let users set "test-only" on java_library, but not on other modules
where the module kind is implicitly test-only, like java_test.
The implementation, not the user decides it is test-only.
We also exclude it from java_defaults.

	% gqui from  "flatten(~/aosp-main-with-phones/out/soong/ownership/all_teams.pb, teams)" proto team.proto:AllTeams 'select teams.kind, count(*) where teams.test_only = true and teams.kind not like "%cc_%" group by teams.kind'
	+--------------------------+----------+
	|        teams.kind        | count(*) |
	+--------------------------+----------+
	| android_test             |     1382 |
	| android_test_helper_app  |     1680 |
	| java_fuzz                |        5 |
	| java_test                |      774 |
	| java_test_helper_library |       29 |
	+--------------------------+----------+

	 % gqui from  "flatten(~/aosp-main-with-phones/out/soong/ownership/all_teams.pb, teams)" proto team.proto:AllTeams 'select teams.kind, count(*) where teams.top_level_target = true and teams.kind not like "%cc_%" group by teams.kind'
	+--------------+----------+
	|  teams.kind  | count(*) |
	+--------------+----------+
	| android_test |     1382 |
	| java_fuzz    |        5 |
	| java_test    |      774 |
	+--------------+----------+

Test: m nothing --no-skip-soong-tests
Test: go test ./java
Test: m all_teams

Bug: b/327280661
Change-Id: I9c3ad947dc3d68d6427abada27449526d69daa6b
diff --git a/java/app.go b/java/app.go
index 7b25775..1aa3afe 100644
--- a/java/app.go
+++ b/java/app.go
@@ -329,6 +329,10 @@
 		a.aapt.manifestValues.applicationId = *applicationId
 	}
 	a.generateAndroidBuildActions(ctx)
+	android.SetProvider(ctx, android.TestOnlyProviderKey, android.TestModuleInformation{
+		TestOnly: true,
+	})
+
 }
 
 func (a *AndroidApp) GenerateAndroidBuildActions(ctx android.ModuleContext) {
@@ -1191,7 +1195,8 @@
 	module.AddProperties(
 		&module.aaptProperties,
 		&module.appProperties,
-		&module.overridableAppProperties)
+		&module.overridableAppProperties,
+		&module.Library.sourceProperties)
 
 	module.usesLibrary.enforce = true
 
@@ -1340,6 +1345,11 @@
 		TestSuites:              a.testProperties.Test_suites,
 		IsHost:                  false,
 	})
+	android.SetProvider(ctx, android.TestOnlyProviderKey, android.TestModuleInformation{
+		TestOnly:       true,
+		TopLevelTarget: true,
+	})
+
 }
 
 func (a *AndroidTest) FixTestConfig(ctx android.ModuleContext, testConfig android.Path) android.Path {
@@ -1532,9 +1542,13 @@
 	android.OverrideModuleBase
 }
 
-func (i *OverrideAndroidTest) GenerateAndroidBuildActions(_ android.ModuleContext) {
+func (i *OverrideAndroidTest) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	// All the overrides happen in the base module.
 	// TODO(jungjw): Check the base module type.
+	android.SetProvider(ctx, android.TestOnlyProviderKey, android.TestModuleInformation{
+		TestOnly:       true,
+		TopLevelTarget: true,
+	})
 }
 
 // override_android_test is used to create an android_app module based on another android_test by overriding