Expose bot_update step name function

To tag reproduction steps on chromium update we need to generate a tag
for the step. Rather than duplicate this piece of code, expose it
in the bot_update module

Bug: 349529661
Change-Id: Ibed143523b3b1af4de222a8617349b815f0c0aaa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5914637
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Struan Shrimpton <sshrimp@google.com>

recipes/README.recipes.md

@@ -63,7 +63,7 @@ Recipe module to ensure a checkout is consistent on a bot.
 
 Wrapper for easy calling of bot_update.
 
-— **def [deapply\_patch](/recipes/recipe_modules/bot_update/api.py#678)(self, bot_update_result):**
+— **def [deapply\_patch](/recipes/recipe_modules/bot_update/api.py#674)(self, bot_update_result):**
 
 Deapplies a patch, taking care of DEPS and solution revisions properly.
     
@@ -105,7 +105,7 @@ Args:
     author.
   * step_tags: a dict {tag name: tag value} of tags to add to the step
 
-— **def [get\_project\_revision\_properties](/recipes/recipe_modules/bot_update/api.py#655)(self, project_name, gclient_config=None):**
+— **def [get\_project\_revision\_properties](/recipes/recipe_modules/bot_update/api.py#651)(self, project_name, gclient_config=None):**
 
 Returns all property names used for storing the checked-out revision of
 a given project.
@@ -121,10 +121,12 @@ Returns (list of str): All properties that'll hold the checked-out revision
 
 &emsp; **@property**<br>&mdash; **def [last\_returned\_properties](/recipes/recipe_modules/bot_update/api.py#99)(self):**
 
-&mdash; **def [resolve\_fixed\_revision](/recipes/recipe_modules/bot_update/api.py#606)(self, bot_update_result, name):**
+&mdash; **def [resolve\_fixed\_revision](/recipes/recipe_modules/bot_update/api.py#602)(self, bot_update_result, name):**
 
 Sets a fixed revision for a single dependency using project revision
 properties.
+
+&mdash; **def [step\_name](/recipes/recipe_modules/bot_update/api.py#691)(self, patch, suffix):**
 ### *recipe_modules* / [depot\_tools](/recipes/recipe_modules/depot_tools)
 
 [DEPS](/recipes/recipe_modules/depot_tools/__init__.py#7): [recipe\_engine/cipd][recipe_engine/recipe_modules/cipd], [recipe\_engine/context][recipe_engine/recipe_modules/context], [recipe\_engine/platform][recipe_engine/recipe_modules/platform], [recipe\_engine/runtime][recipe_engine/recipe_modules/runtime]

recipes/recipe_modules/bot_update/api.py

@@ -423,11 +423,7 @@ class BotUpdateApi(recipe_api.RecipeApi):
         commit_positions=self._test_data.get('commit_positions', True),
     ))
 
-    name = 'bot_update'
-    if not patch:
-      name += ' (without patch)'
-    if suffix:
-      name += ' - %s' % suffix
+    name = self.step_name(patch, suffix)
 
     # Ah hah! Now that everything is in place, lets run bot_update!
     step_result = None
@@ -691,3 +687,11 @@ class BotUpdateApi(recipe_api.RecipeApi):
 
     self.ensure_checkout(
         patch=False, no_fetch_tags=True, update_presentation=False)
+
+  def step_name(self, patch, suffix):
+    name = 'bot_update'
+    if not patch:
+      name += ' (without patch)'
+    if suffix:
+      name += f' - {suffix}'
+    return name