Refactor the way that TestApi works so that it is actually useful.

scripts/slave/recipes/android_webview_aosp.py

Index: scripts/slave/recipes/android_webview_aosp.py
diff --git a/scripts/slave/recipes/android_webview_aosp.py b/scripts/slave/recipes/android_webview_aosp.py
index ee0fe50e310c537e0194a392284f4c3d4c93370f..602ffdaae3519b91364b2de1babf23926a66acd5 100644
--- a/scripts/slave/recipes/android_webview_aosp.py
+++ b/scripts/slave/recipes/android_webview_aosp.py
@@ -27,28 +27,12 @@ def GenSteps(api):
     use_goma=True)
 
 def GenTests(api):
-  def _common_step_mocks():
-    return {
-      'calculate trimmed deps': {
-        'json': {
-          'output': {
-            'blacklist': {
-              'src/blacklist/project/1': None,
-              'src/blacklist/project/2': None,
-            }
-          }
-        }
-      }
-    }
-
   yield 'basic', {
-    'properties': api.properties_scheduled(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.scheduled(),
   }
 
   yield 'uses_android_repo', {
-    'properties': api.properties_scheduled(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.scheduled(),
     'mock' : {
       'path': {
         'exists': [
@@ -59,8 +43,7 @@ def GenTests(api):
   }
 
   yield 'doesnt_sync_if_android_present', {
-    'properties': api.properties_scheduled(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.scheduled(),
     'mock' : {
       'path': {
         'exists': [
@@ -71,8 +54,7 @@ def GenTests(api):
   }
 
   yield 'does_delete_stale_chromium', {
-    'properties': api.properties_scheduled(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.scheduled(),
     'mock' : {
       'path': {
         'exists': [
@@ -83,8 +65,7 @@ def GenTests(api):
   }
 
   yield 'uses_goma_test', {
-    'properties': api.properties_scheduled(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.scheduled(),
     'mock' : {
       'path': {
         'exists': [
@@ -95,11 +76,9 @@ def GenTests(api):
   }
 
   yield 'works_if_revision_not_present', {
-    'properties': api.properties_generic(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.generic(),
   }
 
   yield 'trybot', {
-    'properties': api.properties_tryserver(),
-    'step_mocks': _common_step_mocks(),
+    'properties': api.properties.tryserver(),
   }