[Hotword] Implement IsHotwordHardwareAvailable() using device types.

chrome/browser/extensions/component_loader_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/component_loader.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_pref_service_syncable.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/extension_set.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if defined(OS_CHROMEOS)
+#include "chromeos/audio/cras_audio_handler.h"
+#endif
+
 namespace extensions {
 
 namespace {
 
 class MockExtensionService : public TestExtensionService {
  private:
   bool ready_;
   size_t unloaded_count_;
   ExtensionRegistry* registry_;
 
@@ skipping 56 matching lines @@
 
     // Read in the extension manifest.
     ASSERT_TRUE(base::ReadFileToString(
         extension_path_.Append(kManifestFilename),
         &manifest_contents_));
 
     // Register the local state prefs.
 #if defined(OS_CHROMEOS)
     local_state_.registry()->RegisterBooleanPref(
         prefs::kAccessibilitySpokenFeedbackEnabled, false);
+
+    // Tests on chromeos need to have the handler initialized because the
+    // Hotword component extension uses it to determine which extension to
+    // load.
+    if (!chromeos::CrasAudioHandler::IsInitialized())
+      chromeos::CrasAudioHandler::InitializeForTesting();
 #endif
   }
 
  protected:
   content::TestBrowserThreadBundle thread_bundle_;
   TestingProfile profile_;
   MockExtensionService extension_service_;
   TestingPrefServiceSyncable prefs_;
   TestingPrefServiceSimple local_state_;
   ComponentLoader component_loader_;
@@ skipping 159 matching lines @@
   component_loader_.AddOrReplace(known_extension);
   EXPECT_EQ(default_count + 1, registry->enabled_extensions().size());
   EXPECT_EQ(1u, extension_service_.unloaded_count());
 
   // Add an invalid component extension.
   std::string extension_id = component_loader_.AddOrReplace(invalid_extension);
   EXPECT_TRUE(extension_id.empty());
 }
 
 }  // namespace extensions