Introduce lock screen app context to extension features

extensions/common/features/simple_feature_unittest.cc

Index: extensions/common/features/simple_feature_unittest.cc
diff --git a/extensions/common/features/simple_feature_unittest.cc b/extensions/common/features/simple_feature_unittest.cc
index f446042f5fda369fc0919012da11aec7987631b8..bc7ab325834bdbf93a8b204420e6f1009a27eb6e 100644
--- a/extensions/common/features/simple_feature_unittest.cc
+++ b/extensions/common/features/simple_feature_unittest.cc
@@ -387,6 +387,30 @@ TEST_F(SimpleFeatureTest, Context) {
       extension.get(), Feature::BLESSED_EXTENSION_CONTEXT,
       Feature::UNSPECIFIED_PLATFORM).result());
 
+  feature.contexts_.clear();
+  feature.contexts_.push_back(Feature::BLESSED_EXTENSION_CONTEXT);
+
+  {
+    Feature::Availability availability = feature.IsAvailableToContext(
+        extension.get(), Feature::LOCK_SCREEN_EXTENSION_CONTEXT,
+        Feature::CHROMEOS_PLATFORM);
+    EXPECT_EQ(Feature::INVALID_CONTEXT, availability.result());
+    EXPECT_EQ(
+        "'somefeature' is only allowed to run in privileged pages, "
+        "but this is a lock screen app",
+        availability.message());
+  }
+
+  feature.contexts_.clear();
+  feature.contexts_.push_back(Feature::LOCK_SCREEN_EXTENSION_CONTEXT);
+
+  EXPECT_EQ(Feature::IS_AVAILABLE,
+            feature
+                .IsAvailableToContext(extension.get(),
+                                      Feature::LOCK_SCREEN_EXTENSION_CONTEXT,
+                                      Feature::CHROMEOS_PLATFORM)
+                .result());
+
   feature.set_min_manifest_version(22);
   EXPECT_EQ(Feature::INVALID_MIN_MANIFEST_VERSION, feature.IsAvailableToContext(
       extension.get(), Feature::BLESSED_EXTENSION_CONTEXT,