Build updatable-bcp-packages.txt from prebuilts in sdk snapshot

Previously, the java_import and java_sdk_library_import modules did not
make their permitted_packages available to the rule that generates the
updatable-bcp-packages.txt file. This change corrects that.

Bug: 193095050
Test: m nothing
      - Added unit tests, which all failed and then fixed the tests.
Merged-In: If0706e4551a331b48d383123088e63924dded48b
Change-Id: If0706e4551a331b48d383123088e63924dded48b
(cherry picked from commit 630b11e9d4d63e5fabaa20adf5d1b1c81ede6681)

apex/platform_bootclasspath_test.go

@@ -398,6 +398,7 @@ func TestPlatformBootclasspath_AlwaysUsePrebuiltSdks(t *testing.T) {
 			name: "foo",
 			prefer: false,
 			shared_library: false,
+			permitted_packages: ["foo"],
 			public: {
 				jars: ["sdk_library/public/foo-stubs.jar"],
 				stub_srcs: ["sdk_library/public/foo_stub_sources"],

java/java.go

@@ -1192,6 +1192,12 @@ type Import struct {
 	minSdkVersion android.SdkSpec
 }
 
+var _ PermittedPackagesForUpdatableBootJars = (*Import)(nil)
+
+func (j *Import) PermittedPackagesForUpdatableBootJars() []string {
+	return j.properties.Permitted_packages
+}
+
 func (j *Import) SdkVersion(ctx android.EarlyModuleContext) android.SdkSpec {
 	return android.SdkSpecFrom(ctx, String(j.properties.Sdk_version))
 }

java/sdk_library.go

@@ -1991,6 +1991,12 @@ func sdkLibraryImportFactory() android.Module {
 	return module
 }
 
+var _ PermittedPackagesForUpdatableBootJars = (*SdkLibraryImport)(nil)
+
+func (module *SdkLibraryImport) PermittedPackagesForUpdatableBootJars() []string {
+	return module.properties.Permitted_packages
+}
+
 func (module *SdkLibraryImport) Prebuilt() *android.Prebuilt {
 	return &module.prebuilt
 }

sdk/bootclasspath_fragment_sdk_test.go

@@ -532,6 +532,12 @@ sdk_snapshot {
 				out/soong/.intermediates/frameworks/base/boot/platform-bootclasspath/android_common/hiddenapi-monolithic/index-from-classes.csv
         snapshot/hiddenapi/index.csv
 			`, rule)
+
+			// Make sure that the permitted packages from the prebuilts end up in the
+			// updatable-bcp-packages.txt file.
+			rule = module.Output("updatable-bcp-packages.txt")
+			expectedContents := `'mybootlib\nmyothersdklibrary\n'`
+			android.AssertStringEquals(t, "updatable-bcp-packages.txt", expectedContents, rule.Args["content"])
 		}),
 		snapshotTestPreparer(checkSnapshotWithSourcePreferred, preparerForSnapshot),
 		snapshotTestPreparer(checkSnapshotPreferredWithSource, preparerForSnapshot),