[fuchsia] stamp package with target api level (flutter#30857)

Infrastructure runs the pm command on packages in a different path
which we were not accounting for. This will make sure we stamp the
packages when infra builds them.

tools/fuchsia/build_fuchsia_artifacts.py

@@ -130,7 +130,7 @@ def CopyZirconFFILibIfExists(source, destination):
   destination_base = os.path.join(destination, 'flutter_binaries')
   FindFileAndCopyTo('libzircon_ffi.so', source_root, destination_base)
 
-def CopyToBucketWithMode(source, destination, aot, product, runner_type):
+def CopyToBucketWithMode(source, destination, aot, product, runner_type, api_level):
   mode = 'aot' if aot else 'jit'
   product_suff = '_product' if product else ''
   runner_name = '%s_%s%s_runner' % (runner_type, mode, product_suff)
@@ -142,7 +142,7 @@ def CopyToBucketWithMode(source, destination, aot, product, runner_type):
   key_path = os.path.join(_script_dir, 'development.key')
 
   destination = os.path.join(_bucket_directory, destination, mode)
-  CreateFarPackage(pm_bin, far_base, key_path, destination)
+  CreateFarPackage(pm_bin, far_base, key_path, destination, api_level)
   patched_sdk_dirname = '%s_runner_patched_sdk' % runner_type
   patched_sdk_dir = os.path.join(source_root, patched_sdk_dirname)
   dest_sdk_path = os.path.join(destination, patched_sdk_dirname)
@@ -154,10 +154,17 @@ def CopyToBucketWithMode(source, destination, aot, product, runner_type):
 
 
 def CopyToBucket(src, dst, product=False):
-  CopyToBucketWithMode(src, dst, False, product, 'flutter')
-  CopyToBucketWithMode(src, dst, True, product, 'flutter')
-  CopyToBucketWithMode(src, dst, False, product, 'dart')
-  CopyToBucketWithMode(src, dst, True, product, 'dart')
+  api_level = ReadTargetAPILevel()
+  CopyToBucketWithMode(src, dst, False, product, 'flutter', api_level)
+  CopyToBucketWithMode(src, dst, True, product, 'flutter', api_level)
+  CopyToBucketWithMode(src, dst, False, product, 'dart', api_level)
+  CopyToBucketWithMode(src, dst, True, product, 'dart', api_level)
+
+def ReadTargetAPILevel():
+  filename = os.path.join(os.path.dirname(__file__), 'target_api_level')
+  with open(filename) as f:
+    api_level = f.read().rstrip('\n')
+  return api_level
 
 
 def CopyVulkanDepsToBucket(src, dst, arch):

tools/fuchsia/gen_package.py

@@ -35,11 +35,11 @@ def GenerateManifest(package_dir):
   return manifest_path
 
 
-def CreateFarPackage(pm_bin, package_dir, signing_key, dst_dir):
+def CreateFarPackage(pm_bin, package_dir, signing_key, dst_dir, api_level):
   manifest_path = GenerateManifest(package_dir)
 
   pm_command_base = [
-      pm_bin, '-m', manifest_path, '-k', signing_key, '-o', dst_dir
+      pm_bin, '-m', manifest_path, '-k', signing_key, '-o', dst_dir, '--api-level', api_level
   ]
 
   # Build the package