New product config flag to gate blueprint modules

Example usage:
PRODUCT_INCLUDE_TAGS += use_myspecial_sdk

This also populates the allowlist with go/nogo mainline tags. Usage of
`PRODUCT_INCLUDE_TAGS` outside this allowlist will raise an error
in product config

Test: TH

Change-Id: Ica82a8f65cbfda600d72fc54fb873c1eaa1666a7

core/product.mk

@@ -263,6 +263,9 @@ _product_list_vars += PRODUCT_FORCE_PRODUCT_MODULES_TO_SYSTEM_PARTITION
 # This flag implies PRODUCT_USE_DYNAMIC_PARTITIONS.
 _product_single_value_vars += PRODUCT_RETROFIT_DYNAMIC_PARTITIONS
 
+# List of tags that will be used to gate blueprint modules from the build graph
+_product_list_vars += PRODUCT_INCLUDE_TAGS
+
 # When this is true, various build time as well as runtime debugfs restrictions are enabled.
 _product_single_value_vars += PRODUCT_SET_DEBUGFS_RESTRICTIONS
 

core/product_config.mk

@@ -274,6 +274,14 @@ endif
 current_product_makefile :=
 
 #############################################################################
+# Check product include tag allowlist
+BLUEPRINT_INCLUDE_TAGS_ALLOWLIST := com.android.mainline_go com.android.mainline
+.KATI_READONLY := BLUEPRINT_INCLUDE_TAGS_ALLOWLIST
+$(foreach include_tag,$(PRODUCT_INCLUDE_TAGS), \
+	$(if $(filter $(include_tag),$(BLUEPRINT_INCLUDE_TAGS_ALLOWLIST)),,\
+	$(call pretty-error, $(include_tag) is not in BLUEPRINT_INCLUDE_TAGS_ALLOWLIST: $(BLUEPRINT_INCLUDE_TAGS_ALLOWLIST))))
+#############################################################################
+
 # Quick check and assign default values
 
 TARGET_DEVICE := $(PRODUCT_DEVICE)

core/soong_config.mk

@@ -300,6 +300,8 @@ $(call add_json_bool, GenerateAidlNdkPlatformBackend, $(filter true,$(NEED_AIDL_
 
 $(call add_json_bool, IgnorePrefer32OnDevice, $(filter true,$(IGNORE_PREFER32_ON_DEVICE)))
 
+$(call add_json_list, IncludeTags,                $(PRODUCT_INCLUDE_TAGS))
+
 $(call json_end)
 
 $(file >$(SOONG_VARIABLES).tmp,$(json_contents))