Improve testing of mainline_modules_sdks.py

Adds a test for a com.google name module and makes the structure of the
test snapshot created by FakeSnapshotBuilder.create_snapshot_file()
match the names used in an actual sdk snapshot.

Bug: 218685706
Test: atest --host mainline_modules_sdks_test
      pyformat -s 4 --force_quote_type double -i build/mainline_modules_sdks*.py
      /usr/bin/pylint --rcfile $ANDROID_BUILD_TOP/tools/repohooks/tools/pylintrc build/mainline_modules_sdks*.py
Change-Id: Ia11cbb2da717218ba0b2da9a2238856dc8cebf8f

build/mainline_modules_sdks.py

@@ -736,6 +736,18 @@ def create_producer():
     )
 
 
+def aosp_to_google(module):
+    """Transform an AOSP module into a Google module"""
+    new_apex = aosp_to_google_name(module.apex)
+    # Create a copy of the AOSP module with the internal specific APEX name.
+    return dataclasses.replace(module, apex=new_apex)
+
+
+def aosp_to_google_name(name):
+    """Transform an AOSP module name into a Google module name"""
+    return name.replace("com.android.", "com.google.android.")
+
+
 def filter_modules(modules):
     target_build_apps = os.environ.get("TARGET_BUILD_APPS")
     if target_build_apps: