[ios] Implements even more of ChromiumBrowserProvider.

ios/chrome/browser/providers/chromium_voice_search_provider.mm

Index: ios/chrome/browser/providers/chromium_voice_search_provider.mm
diff --git a/ios/chrome/browser/providers/chromium_voice_search_provider.mm b/ios/chrome/browser/providers/chromium_voice_search_provider.mm
index d35449b3645db3ae611c05249a6b5dbf36487a62..dbf64f9e8f725f79ae405363c1bf4dd3bab4b90d 100644
--- a/ios/chrome/browser/providers/chromium_voice_search_provider.mm
+++ b/ios/chrome/browser/providers/chromium_voice_search_provider.mm
@@ -4,6 +4,8 @@
 
 #import "ios/chrome/browser/providers/chromium_voice_search_provider.h"
 
+#import "ios/public/provider/chrome/browser/voice/voice_search_language.h"
+
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
@@ -15,3 +17,18 @@ ChromiumVoiceSearchProvider::~ChromiumVoiceSearchProvider() {}
 bool ChromiumVoiceSearchProvider::IsVoiceSearchEnabled() const {
   return false;
 }
+
+NSArray* ChromiumVoiceSearchProvider::GetAvailableLanguages() const {
+  // Add two arbitrary languages to the list, so that options show up in the
+  // voice search settings page.
+  VoiceSearchLanguage* en_US =
+      [[VoiceSearchLanguage alloc] initWithIdentifier:@"en-US"
+                                          displayName:@"English (US)"
+                               localizationPreference:nil];
+  VoiceSearchLanguage* fr =
+      [[VoiceSearchLanguage alloc] initWithIdentifier:@"fr"
+                                          displayName:@"French"
+                               localizationPreference:nil];
+
+  return @[ en_US, fr ];
+}