Convert Soong licenses attribute to Bazel's applicable_licenses attribute

Add it to the `CommonAttributes` struct and handle it in fillCommonBp2BuildModuleAttrs

Bug: 190817312
Test: treehugger
Change-Id: I7b21056e680384d4046372ee844512029721026e

android/module.go

@@ -919,6 +919,8 @@ type CommonAttributes struct {
 	Data bazel.LabelListAttribute
 
 	Tags bazel.StringListAttribute
+
+	Applicable_licenses bazel.LabelListAttribute
 }
 
 // constraintAttributes represents Bazel attributes pertaining to build constraints,
@@ -1231,6 +1233,8 @@ func (attrs *CommonAttributes) fillCommonBp2BuildModuleAttrs(ctx *topDownMutator
 		}
 	}
 
+	attrs.Applicable_licenses = bazel.MakeLabelListAttribute(BazelLabelForModuleDeps(ctx, mod.commonProperties.Licenses))
+
 	// The required property can contain the module itself. This causes a cycle
 	// when generated as the 'data' label list attribute in Bazel. Remove it if
 	// it exists. See b/247985196.

bp2build/build_conversion_test.go

@@ -1821,3 +1821,30 @@ filegroup {
 		})
 	}
 }
+
+func TestLicensesAttrConversion(t *testing.T) {
+	RunBp2BuildTestCase(t,
+		func(ctx android.RegistrationContext) {
+			ctx.RegisterModuleType("license", android.LicenseFactory)
+		},
+		Bp2buildTestCase{
+			Description:                "Test that licenses: attribute is converted",
+			ModuleTypeUnderTest:        "filegroup",
+			ModuleTypeUnderTestFactory: android.FileGroupFactory,
+			Blueprint: `
+license {
+    name: "my_license",
+}
+filegroup {
+    name: "my_filegroup",
+    licenses: ["my_license"],
+}
+`,
+			ExpectedBazelTargets: []string{
+				MakeBazelTargetNoRestrictions("filegroup", "my_filegroup", AttrNameToString{
+					"applicable_licenses": `[":my_license"]`,
+				}),
+				MakeBazelTargetNoRestrictions("android_license", "my_license", AttrNameToString{}),
+			},
+		})
+}