Adds facilities for extracting Intl.message calls and generating code from translations

pkg/pkg.status

Index: pkg/pkg.status
diff --git a/pkg/pkg.status b/pkg/pkg.status
index 246ec1210cc510af326529d3bba82dca153e6e8f..3ca9e890d070a31ca04945d22248996184a39e63 100644
--- a/pkg/pkg.status
+++ b/pkg/pkg.status
@@ -33,6 +33,7 @@ pathos/test/*: Skip
 intl/test/date_time_format_file_even_test: Skip
 intl/test/date_time_format_file_odd_test: Skip
 intl/test/find_default_locale_standalone_test: Skip
+intl/test/message_extraction/message_extraction_test: Skip
 analyzer_experimental/test/options_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/ast_test: Skip # Imports dart:io.
 analyzer_experimental/test/generated/element_test: Skip # Imports dart:io.
@@ -67,8 +68,6 @@ intl/test/date_time_format_http_request_test: Skip
 [ $compiler == dart2js ]
 # Skip intl_message tests that use mirrors on dart2js until it's been
 # implemented there.
-intl/test/intl_message_test: Skip
-intl/test/intl_message_basic_example_test: Skip
 serialization/test/serialization_test: Skip
 analyzer_experimental/test/generated/ast_test: Skip
 analyzer_experimental/test/generated/element_test: Skip