Bug 1245064 - Lower specificationLevel to 0; r=automatedtester

Marionette is not yet compatible with the WebDriver specification, and
we indicate this by lowering the specificationLevel capability to 0.
This lets us "gate" specification-compatible features, such as the new
element interactability algorithm.

The new interactability algorithm can be enabled by requesting the
capability specificationLevel 1.

MozReview-Commit-ID: 6wsEAsBtR6P

--HG--
extra : rebase_source : f37444470987bb782f32e190e3b5476eb139f142

testing/marionette/driver.js

@@ -138,7 +138,7 @@ this.GeckoDriver = function(appName, device, stopSignal, emulator) {
     "browserVersion": Services.appinfo.version,
     "platformName": Services.sysinfo.getProperty("name"),
     "platformVersion": Services.sysinfo.getProperty("version"),
-    "specificationLevel": "1",
+    "specificationLevel": 0,
 
     // supported features
     "raisesAccessibilityExceptions": false,

testing/marionette/harness/marionette/tests/unit/test_capabilities.py

@@ -34,6 +34,7 @@ class TestCapabilities(MarionetteTestCase):
         self.assertEqual(self.caps["browserVersion"], self.appinfo["version"])
         self.assertEqual(self.caps["platformName"], self.os_name)
         self.assertEqual(self.caps["platformVersion"], self.os_version)
+        self.assertEqual(self.caps["specificationLevel"], 0)
 
     def test_supported_features(self):
         self.assertIn("rotatable", self.caps)
@@ -67,6 +68,12 @@ class TestCapabilities(MarionetteTestCase):
         caps = self.marionette.session_capabilities
         self.assertIn("somethingAwesome", caps)
 
+    def test_set_specification_level(self):
+        self.marionette.delete_session()
+        self.marionette.start_session({"specificationLevel": 1})
+        caps = self.marionette.session_capabilities
+        self.assertEqual(1, caps["specificationLevel"])
+
     def test_we_dont_overwrite_server_capabilities(self):
         self.marionette.delete_session()
         capabilities = {"desiredCapabilities": {"browserName": "ChocolateCake"}}