Support adding suffixes to module names and deps.

This is helpful for crates like protobuf and syn for which we have
multiple versions, and will let us eliminate several patch files

Test: Ran it on everything in external/rust/crates.
Change-Id: I29ac1ee69be99b7164e1458e0d8fc1cb028b15a0

scripts/cargo2android.py

@@ -337,7 +337,7 @@ class Crate(object):
       self.srcs.append(other.main_src)
       # use a short unique name as the merged module name.
       prefix = self.root_pkg + '_tests'
-      self.module_name = self.runner.claim_module_name(prefix, self, 0)
+      self.module_name = self.runner.claim_module_name(prefix, self, 0) + self.runner.args.name_suffix
       self.stem = self.module_name
       # This normalized root_pkg name although might be the same
       # as other module's crate_name, it is not actually used for
@@ -502,7 +502,7 @@ class Crate(object):
     self.shared_libs = sorted(set(self.shared_libs))
     self.crate_types = sorted(set(self.crate_types))
     self.decide_module_type()
-    self.module_name = altered_name(self.stem)
+    self.module_name = altered_name(self.stem) + self.runner.args.name_suffix
     return self
 
   def get_pkg_version(self):
@@ -822,30 +822,30 @@ class Crate(object):
       self.module_type = 'rust_binary' + host
       # In rare cases like protobuf-codegen, the output binary name must
       # be renamed to use as a plugin for protoc.
-      self.stem = altered_stem(self.crate_name) + suffix
+      self.stem = altered_stem(self.crate_name) + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem)
     elif crate_type == 'lib':  # rust_library[_host]
       # TODO(chh): should this be rust_library[_host]?
       # Assuming that Cargo.toml do not use both 'lib' and 'rlib',
       # because we map them both to rlib.
       self.module_type = 'rust_library' + rlib + host
-      self.stem = 'lib' + self.crate_name + suffix
+      self.stem = 'lib' + self.crate_name + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem)
     elif crate_type == 'rlib':  # rust_library[_host]
       self.module_type = 'rust_library' + rlib + host
-      self.stem = 'lib' + self.crate_name + suffix
+      self.stem = 'lib' + self.crate_name + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem)
     elif crate_type == 'dylib':  # rust_library[_host]_dylib
       self.module_type = 'rust_library' + host + '_dylib'
-      self.stem = 'lib' + self.crate_name + suffix
+      self.stem = 'lib' + self.crate_name + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem) + '_dylib'
     elif crate_type == 'cdylib':  # rust_library[_host]_shared
       self.module_type = 'rust_ffi' + host + '_shared'
-      self.stem = 'lib' + self.crate_name + suffix
+      self.stem = 'lib' + self.crate_name + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem) + '_shared'
     elif crate_type == 'staticlib':  # rust_library[_host]_static
       self.module_type = 'rust_ffi' + host + '_static'
-      self.stem = 'lib' + self.crate_name + suffix
+      self.stem = 'lib' + self.crate_name + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem) + '_static'
     elif crate_type == 'test':  # rust_test[_host]
       self.module_type = 'rust_test' + host
@@ -863,12 +863,12 @@ class Crate(object):
         # crate name. We ignore -C and use claim_module_name to get
         # unique sequential suffix.
         self.module_name = self.runner.claim_module_name(
-            self.module_name, self, 0)
+            self.module_name, self, 0) + self.runner.args.name_suffix
         # Now the module name is unique, stem should also match and unique.
         self.stem = self.module_name
     elif crate_type == 'proc-macro':  # rust_proc_macro
       self.module_type = 'rust_proc_macro'
-      self.stem = 'lib' + self.crate_name + suffix
+      self.stem = 'lib' + self.crate_name + suffix + self.runner.args.name_suffix
       self.module_name = altered_name(self.stem)
     else:  # unknown module type, rust_prebuilt_dylib? rust_library[_host]?
       self.module_type = ''
@@ -949,6 +949,8 @@ class Crate(object):
         lib_name = re.sub(' .*$', '', lib)
       if lib_name in self.runner.variant_args.dependency_blocklist:
         continue
+      if lib_name in self.runner.args.dep_suffixes:
+        lib_name += self.runner.args.dep_suffixes[lib_name]
       if lib.endswith('.rlib') or lib.endswith('.rmeta'):
         # On MacOS .rmeta is used when Linux uses .rlib or .rmeta.
         rust_libs += '        "' + altered_name('lib' + lib_name + dependency_suffix) + '",\n'
@@ -1893,6 +1895,15 @@ def get_parser() -> argparse.ArgumentParser:
       type=str,
       help=('Dump command-line arguments (minus this flag) to a config file and exit. ' +
             'This is intended to help migrate from command line options to config files.'))
+  parser.add_argument(
+      '--name-suffix',
+      type=str,
+      default='',
+      help=('Add this suffix to the module name.'))
+  parser.add_argument(
+      '--dep-suffixes',
+      default={},
+      help=('Add these suffixes to the specified dependencies'))
   parser.add_argument(
       '--config',
       type=str,