Code refactoring to build targets in a separate method.

The build_snapshot method is creating a list of targets and building
them by calling soong.
The code sets some environment variables and builds the targets. This
code can be made reusable by putting it into a separate method and
passing the list of targets to be built. This will avoid code
redundancy.

Bug: 230609867
Test: The code builds on the intellij and successfully builds all the
targets passed to this newly added method.

Change-Id: I22566ca438b2da0cf832416466f4e3affb1c976e

build/mainline_modules_sdks.py

@@ -246,17 +246,7 @@ class SnapshotBuilder:
         return os.path.join(self.mainline_sdks_dir,
                             f"{sdk_name}-{sdk_version}.zip")
 
-    def build_snapshots(self, build_release, sdk_versions, modules):
-        # Build the SDKs once for each version.
-        for sdk_version in sdk_versions:
-            # Compute the paths to all the Soong generated sdk snapshot files
-            # required by this script.
-            paths = [
-                sdk_snapshot_zip_file(self.mainline_sdks_dir, sdk, sdk_version)
-                for module in modules
-                for sdk in module.sdks
-            ]
-
+    def build_target_paths(self, build_release, sdk_version, target_paths):
         # Extra environment variables to pass to the build process.
         extraEnv = {
             # TODO(ngeoffray): remove SOONG_ALLOW_MISSING_DEPENDENCIES, but
@@ -276,8 +266,7 @@ class SnapshotBuilder:
         # This MUST be identical to the TARGET_BUILD_VARIANT used to build
         # the corresponding APEXes otherwise it could result in different
         # hidden API flags, see http://b/202398851#comment29 for more info.
-            target_build_variant = os.environ.get("TARGET_BUILD_VARIANT",
-                                                  "user")
+        target_build_variant = os.environ.get("TARGET_BUILD_VARIANT", "user")
         cmd = [
                   "build/soong/soong_ui.bash",
                   "--make-mode",
@@ -286,11 +275,24 @@ class SnapshotBuilder:
                   "TARGET_PRODUCT=mainline_sdk",
                   "MODULE_BUILD_FROM_SOURCE=true",
                   "out/soong/apex/depsinfo/new-allowed-deps.txt.check",
-            ] + paths
+              ] + target_paths
         print_command(extraEnv, cmd)
         env = os.environ.copy()
         env.update(extraEnv)
         self.subprocess_runner.run(cmd, env=env)
+
+    def build_snapshots(self, build_release, sdk_versions, modules):
+        # Build the SDKs once for each version.
+        for sdk_version in sdk_versions:
+            # Compute the paths to all the Soong generated sdk snapshot files
+            # required by this script.
+            paths = [
+                sdk_snapshot_zip_file(self.mainline_sdks_dir, sdk, sdk_version)
+                for module in modules
+                for sdk in module.sdks
+            ]
+
+            self.build_target_paths(build_release, sdk_version, paths)
         return self.mainline_sdks_dir
 
     def build_snapshots_for_build_r(self, build_release, sdk_versions, modules):