[REF] tests: add parameter to choose chrome size

When using the HttpCase browser_js method, the window size is fixed to
1366x768.

With this commit, the default window size is still '1366x768' but a test
class that inherits from HttpCase may change it to test mobile layout
by changing the browser_size class attribute.

The browser is instanciated once per test class, for that reason the
window size cannot be changed in the class methods.

To use different sizes in tests, the tests have to be splitted in
classes.

closes odoo/odoo#28760

odoo/tests/common.py

@@ -447,7 +447,7 @@ class SavepointCase(SingleTransactionCase):
 class ChromeBrowser():
     """ Helper object to control a Chrome headless process. """
 
-    def __init__(self, logger):
+    def __init__(self, logger, window_size):
         self._logger = logger
         if websocket is None:
             self._logger.warning("websocket-client module is not installed")
@@ -459,6 +459,7 @@ class ChromeBrowser():
         self.user_data_dir = tempfile.mkdtemp(suffix='_chrome_odoo')
         self.chrome_process = None
         self.screencast_frames = []
+        self.window_size = window_size
         self._chrome_start()
         self._find_websocket()
         self._logger.info('Websocket url found: %s', self.ws_url)
@@ -529,7 +530,7 @@ class ChromeBrowser():
             '--disable-extensions': '',
             '--user-data-dir': self.user_data_dir,
             '--disable-translate': '',
-            '--window-size': '1366x768',
+            '--window-size': self.window_size,
             '--remote-debugging-port': str(self.devtools_port),
             '--no-sandbox': '',
         }
@@ -789,6 +790,7 @@ class HttpCase(TransactionCase):
     """
     registry_test_mode = True
     browser = None
+    browser_size = '1366x768'
 
     def __init__(self, methodName='runTest'):
         super(HttpCase, self).__init__(methodName)
@@ -804,7 +806,7 @@ class HttpCase(TransactionCase):
     def start_browser(cls, logger):
         # start browser on demand
         if cls.browser is None:
-            cls.browser = ChromeBrowser(logger)
+            cls.browser = ChromeBrowser(logger, cls.browser_size)
 
     @classmethod
     def tearDownClass(cls):