Add TestApexes to ApexInfo

If any of apexes in apex_available is an apex_test, then that name will
be propagated down from that apex to each apex variant. This metadata
will be used to enforce that stub libraries cannot have more than one
apex_available.

This logic is necessary so that bp2build can select the correct
stub/impl.

(To avoid replicating this complexity in Bazel, we should consider
dropping the test apexes in Bazel BUILD files, next CL)

Bug: 277651159
Test: go build ./apex
Change-Id: I63617c1dc2a2d5c9cd7758c416fec7b4db1f10a7
diff --git a/android/apex_test.go b/android/apex_test.go
index 0bf4c9c..ddc730d 100644
--- a/android/apex_test.go
+++ b/android/apex_test.go
@@ -33,10 +33,10 @@
 		{
 			name: "single",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex10000", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
+				{"apex10000", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantAliases: [][2]string{
 				{"foo", "apex10000"},
@@ -45,11 +45,11 @@
 		{
 			name: "merge",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
-				{"bar", FutureApiLevel, false, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
+				{"bar", FutureApiLevel, false, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex10000", FutureApiLevel, false, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, false}},
+				{"apex10000", FutureApiLevel, false, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, false, nil}},
 			wantAliases: [][2]string{
 				{"bar", "apex10000"},
 				{"foo", "apex10000"},
@@ -58,12 +58,12 @@
 		{
 			name: "don't merge version",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
-				{"bar", uncheckedFinalApiLevel(30), false, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
+				{"bar", uncheckedFinalApiLevel(30), false, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex30", uncheckedFinalApiLevel(30), false, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
-				{"apex10000", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
+				{"apex30", uncheckedFinalApiLevel(30), false, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
+				{"apex10000", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantAliases: [][2]string{
 				{"bar", "apex30"},
@@ -73,11 +73,11 @@
 		{
 			name: "merge updatable",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
-				{"bar", FutureApiLevel, true, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
+				{"bar", FutureApiLevel, true, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex10000", FutureApiLevel, true, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex},
+				{"apex10000", FutureApiLevel, true, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantAliases: [][2]string{
 				{"bar", "apex10000"},
@@ -87,15 +87,15 @@
 		{
 			name: "don't merge when for prebuilt_apex",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
-				{"bar", FutureApiLevel, true, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
+				{"bar", FutureApiLevel, true, false, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
 				// This one should not be merged in with the others because it is for
 				// a prebuilt_apex.
-				{"baz", FutureApiLevel, true, false, []string{"baz"}, []string{"baz"}, nil, ForPrebuiltApex},
+				{"baz", FutureApiLevel, true, false, []string{"baz"}, []string{"baz"}, nil, ForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex10000", FutureApiLevel, true, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex},
-				{"baz", FutureApiLevel, true, false, []string{"baz"}, []string{"baz"}, nil, ForPrebuiltApex},
+				{"apex10000", FutureApiLevel, true, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex, nil},
+				{"baz", FutureApiLevel, true, false, []string{"baz"}, []string{"baz"}, nil, ForPrebuiltApex, nil},
 			},
 			wantAliases: [][2]string{
 				{"bar", "apex10000"},
@@ -105,11 +105,11 @@
 		{
 			name: "merge different UsePlatformApis but don't allow using platform api",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
-				{"bar", FutureApiLevel, false, true, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, false, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
+				{"bar", FutureApiLevel, false, true, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex10000", FutureApiLevel, false, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex},
+				{"apex10000", FutureApiLevel, false, false, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantAliases: [][2]string{
 				{"bar", "apex10000"},
@@ -119,11 +119,11 @@
 		{
 			name: "merge same UsePlatformApis and allow using platform api",
 			in: []ApexInfo{
-				{"foo", FutureApiLevel, false, true, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex},
-				{"bar", FutureApiLevel, false, true, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex},
+				{"foo", FutureApiLevel, false, true, []string{"foo"}, []string{"foo"}, nil, NotForPrebuiltApex, nil},
+				{"bar", FutureApiLevel, false, true, []string{"bar"}, []string{"bar"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantMerged: []ApexInfo{
-				{"apex10000", FutureApiLevel, false, true, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex},
+				{"apex10000", FutureApiLevel, false, true, []string{"bar", "foo"}, []string{"bar", "foo"}, nil, NotForPrebuiltApex, nil},
 			},
 			wantAliases: [][2]string{
 				{"bar", "apex10000"},