Expose kv-storage built-in module only on SecureContexts

This CL adds actual restriction in Blink implementation.

This CL also modifies tests and expectations to match with
the current Blink built-in/import maps infra.

A subtest in WPT test `import-statement.html` is failing
because the current Blink implementation is based on
pre-import-map spec and thus
importing unavailable built-in causes fetch error.
See 'import 'std:nonexistent';' row of
https://github.com/WICG/import-maps/issues/159.

Bug: 977470
Change-Id: I107f60ed95e1f91d62f468c29c5d741eef13f4f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1702754
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691821}

third_party/blink/renderer/core/script/modulator_impl_base.cc

@@ -54,6 +54,14 @@ bool ModulatorImplBase::BuiltInModuleInfraEnabled() const {
 
 bool ModulatorImplBase::BuiltInModuleEnabled(layered_api::Module module) const {
   DCHECK(BuiltInModuleInfraEnabled());
+
+  // Some built-in APIs are available only on SecureContexts.
+  // https://crbug.com/977470
+  if (BuiltInModuleRequireSecureContext(module) &&
+      !GetExecutionContext()->IsSecureContext()) {
+    return false;
+  }
+
   if (RuntimeEnabledFeatures::BuiltInModuleAllEnabled())
     return true;
   switch (module) {
@@ -74,6 +82,20 @@ bool ModulatorImplBase::BuiltInModuleEnabled(layered_api::Module module) const {
   }
 }
 
+bool ModulatorImplBase::BuiltInModuleRequireSecureContext(
+    layered_api::Module module) {
+  switch (module) {
+    case layered_api::Module::kBlank:
+    case layered_api::Module::kElementsInternal:
+    case layered_api::Module::kElementsSwitch:
+    case layered_api::Module::kElementsToast:
+    case layered_api::Module::kElementsVirtualScroller:
+      return false;
+    case layered_api::Module::kKvStorage:
+      return true;
+  }
+}
+
 void ModulatorImplBase::BuiltInModuleUseCount(
     layered_api::Module module) const {
   DCHECK(BuiltInModuleInfraEnabled());

third_party/blink/renderer/core/script/modulator_impl_base.h

@@ -45,6 +45,8 @@ class ModulatorImplBase : public Modulator {
   bool BuiltInModuleEnabled(layered_api::Module) const override;
   void BuiltInModuleUseCount(layered_api::Module) const override;
 
+  static bool BuiltInModuleRequireSecureContext(layered_api::Module);
+
   ModuleRecordResolver* GetModuleRecordResolver() override {
     return module_record_resolver_.Get();
   }

third_party/blink/web_tests/external/wpt/kv-storage/secure-context/import-maps-expected.txt

-This is a testharness.js-based test.
-PASS Prerequisite check
-FAIL KV Storage: in non-secure contexts, import map mappings should fall back promise_test: Unhandled rejection with value: object "TypeError: Failed to resolve module specifier 'std:kv-storage'"
-Harness: the test ran to completion.
-

third_party/blink/web_tests/external/wpt/kv-storage/secure-context/import-maps.html

@@ -15,7 +15,7 @@ test(() => {
 <script type="importmap">
 {
   "imports": {
-    "std:kv-storage": [
+    "./resources/dummy-module.js": [
       "std:kv-storage",
       "./resources/dummy-module.js"
     ]
@@ -25,7 +25,7 @@ test(() => {
 
 <script type="module">
 promise_test(async () => {
-  const result = await import("std:kv-storage");
-  assert_equals(namespaceObj.myExport, "not the real KV storage");
+  const result = await import("./resources/dummy-module.js");
+  assert_equals(result.myExport, "not the real KV storage");
 });
 </script>

third_party/blink/web_tests/external/wpt/kv-storage/secure-context/side-effects-expected.txt → third_party/blink/web_tests/external/wpt/kv-storage/secure-context/import-statement-expected.txt

 This is a testharness.js-based test.
 PASS Prerequisite check
-FAIL KV Storage: should fail in non-secure contexts in the fetching phase, not evaluation phase assert_false: The side effects module didn't evaluate either expected false got true
+FAIL Static import kv-storage in non-secure context assert_unreached: script error event should not be fired Reached unreachable code
 Harness: the test ran to completion.
 

third_party/blink/web_tests/external/wpt/kv-storage/secure-context/import-statement.html

@@ -13,13 +13,14 @@ test(() => {
   assert_false(self.isSecureContext, "This test must run in a non-secure context");
 }, "Prerequisite check");
 
-async_test(t => {
-  window.addEventListener("error", t.step_func_done(errorEvent => {
-    assert_equals(errorEvent.error.constructor, TypeError, "Must trigger a TypeError");
-  }, { once: true }));
-});
+const t = async_test('Static import kv-storage in non-secure context');
+
+window.addEventListener("error", t.step_func_done(errorEvent => {
+  assert_equals(errorEvent.error.constructor, TypeError, "Must trigger a TypeError");
+}, { once: true }));
 </script>
 
-<script type="module">
+<script type="module"
+  onerror="t.unreached_func('script error event should not be fired')()">
 import "std:kv-storage";
 </script>

third_party/blink/web_tests/external/wpt/kv-storage/secure-context/script-element-expected.txt

-This is a testharness.js-based test.
-Harness Error. harness_status.status = 1 , harness_status.message = Uncaught TypeError: KV Storage is only available in secure contexts
-PASS Prerequisite check
-FAIL Check the events assert_unreached: load event fired Reached unreachable code
-Harness: the test ran to completion.
-