Expose way to enable/disable translate.

ios/web_view/internal/cwv_web_view_configuration.mm

Index: ios/web_view/internal/cwv_web_view_configuration.mm
diff --git a/ios/web_view/internal/cwv_web_view_configuration.mm b/ios/web_view/internal/cwv_web_view_configuration.mm
index 736dfbbd3fafcc0810b8aa849780bd4b3c28a064..69818a88c53ce000e0bf3330feab5777706bd5c3 100644
--- a/ios/web_view/internal/cwv_web_view_configuration.mm
+++ b/ios/web_view/internal/cwv_web_view_configuration.mm
@@ -9,6 +9,7 @@
 #include "base/threading/thread_restrictions.h"
 #include "ios/web_view/internal/app/application_context.h"
 #import "ios/web_view/internal/cwv_user_content_controller_internal.h"
+#import "ios/web_view/internal/translate/cwv_translation_configuration_internal.h"
 #include "ios/web_view/internal/web_view_browser_state.h"
 #include "ios/web_view/internal/web_view_global_state_util.h"
 
@@ -28,6 +29,7 @@
 
 @implementation CWVWebViewConfiguration
 
+@synthesize translationConfiguration = _translationConfiguration;
 @synthesize userContentController = _userContentController;
 
 + (instancetype)defaultConfiguration {
@@ -68,6 +70,9 @@
   if (self) {
     _browserState = std::move(browserState);
 
+    _translationConfiguration = [[CWVTranslationConfiguration alloc]
+        initWithPrefService:_browserState->GetPrefs()];
+
     _userContentController =
         [[CWVUserContentController alloc] initWithConfiguration:self];
   }