Move proguard test files to java package

The proguard test files are duplicated in apex and sysprop and will
be needed by app tests, move them to the java package.

Test: run all soong tests
Change-Id: Ie13817dcda8d98801d16a97ffceef1100c7d5380

apex/apex_test.go

@@ -202,8 +202,6 @@ var prepareForApexTest = android.GroupFixturePreparers(
 		"myapex.apks":                          nil,
 		"frameworks/base/api/current.txt":      nil,
 		"framework/aidl/a.aidl":                nil,
-		"build/make/core/proguard.flags":             nil,
-		"build/make/core/proguard_basic_keeps.flags": nil,
 		"dummy.txt":                            nil,
 		"baz":                                  nil,
 		"bar/baz":                              nil,

java/testing.go

@@ -70,6 +70,10 @@ var PrepareForTestWithJavaDefaultModulesWithoutFakeDex2oatd = android.GroupFixtu
 		defaultJavaDir + "/framework/aidl": nil,
 		// Needed for various deps defined in GatherRequiredDepsForTest()
 		defaultJavaDir + "/a.java": nil,
+
+		// Needed for R8 rules on apps
+		"build/make/core/proguard.flags":             nil,
+		"build/make/core/proguard_basic_keeps.flags": nil,
 	}.AddToFixture(),
 	// The java default module definitions.
 	android.FixtureAddTextFile(defaultJavaDir+"/Android.bp", gatherRequiredDepsForTest()),

sysprop/sysprop_test.go

@@ -98,9 +98,6 @@ func test(t *testing.T, bp string) *android.TestResult {
 
 		"build/soong/scripts/jar-wrapper.sh": nil,
 
-		"build/make/core/proguard.flags":             nil,
-		"build/make/core/proguard_basic_keeps.flags": nil,
-
 		"jdk8/jre/lib/jce.jar": nil,
 		"jdk8/jre/lib/rt.jar":  nil,
 		"jdk8/lib/tools.jar":   nil,