Add a mojoPrivate API that exposes mojo to component apps/extensions.

extensions/renderer/api/mojo_private/mojo_private_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "extensions/renderer/api_test_base.h"
+
+#include "gin/modules/module_registry.h"
+
+// A test launcher for tests for the mojoPrivate API defined in
+// extensions/test/data/mojo_private_unittest.js.
+
+namespace extensions {
+
+class MojoPrivateApiTest : public ApiTestBase {
+ public:
+  MojoPrivateApiTest() = default;
+
+  gin::ModuleRegistry* module_registry() {
+    return gin::ModuleRegistry::From(env()->context()->v8_context());
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MojoPrivateApiTest);
+};
+
+TEST_F(MojoPrivateApiTest, Define) {
+  ASSERT_NO_FATAL_FAILURE(RunTest("mojo_private_unittest.js", "testDefine"));
+  EXPECT_EQ(1u, module_registry()->available_modules().count("testModule"));
+}
+
+TEST_F(MojoPrivateApiTest, DefineRegistersModule) {
+  ASSERT_NO_FATAL_FAILURE(
+      RunTest("mojo_private_unittest.js", "testDefineRegistersModule"));
+  EXPECT_EQ(1u, module_registry()->available_modules().count("testModule"));
+  EXPECT_EQ(1u, module_registry()->available_modules().count("dependency"));
+}
+
+TEST_F(MojoPrivateApiTest, DefineModuleDoesNotExist) {
+  ASSERT_NO_FATAL_FAILURE(
+      RunTest("mojo_private_unittest.js", "testDefineModuleDoesNotExist"));
+  EXPECT_EQ(0u, module_registry()->available_modules().count("testModule"));
+  EXPECT_EQ(0u,
+            module_registry()->available_modules().count("does not exist!"));
+  EXPECT_EQ(1u, module_registry()->unsatisfied_dependencies().count(
+                    "does not exist!"));
+}
+
+}  // namespace extensions