Implemented new Translate API for purely Objective-C clients.

ios/web_view/shell/translate_controller.m

Index: ios/web_view/shell/translate_controller.m
diff --git a/ios/web_view/shell/translate_controller.m b/ios/web_view/shell/translate_controller.m
index e28d0089282d7c3dfb9a593a323ecc0a0a81c229..9cbf875670c8aa96516d32f7e54c380e8a797057 100644
--- a/ios/web_view/shell/translate_controller.m
+++ b/ios/web_view/shell/translate_controller.m
@@ -14,54 +14,60 @@
 @interface TranslateController ()
 // Action Sheet to prompt user whether or not the page should be translated.
 @property(nonatomic, strong) UIAlertController* beforeTranslateActionSheet;
-// Manager which performs the translation of the content.
-@property(nonatomic, strong) id<CWVTranslateManager> translateManager;
 @end
 
 @implementation TranslateController
 
 @synthesize beforeTranslateActionSheet = _beforeTranslateActionSheet;
-@synthesize translateManager = _translateManager;
 
 - (void)dealloc {
   [_beforeTranslateActionSheet dismissViewControllerAnimated:YES
                                                   completion:nil];
 }
 
-#pragma mark CWVTranslateDelegate methods
+#pragma mark - CWVTranslationDelegate methods
 
-- (void)translateStepChanged:(CRIWVTransateStep)step
-                     manager:(id<CWVTranslateManager>)manager {
-  if (step == CRIWVTransateStepBeforeTranslate) {
-    self.translateManager = manager;
-    self.beforeTranslateActionSheet = [UIAlertController
-        alertControllerWithTitle:nil
-                         message:@"Translate?"
-                  preferredStyle:UIAlertControllerStyleActionSheet];
-    UIAlertAction* cancelAction =
-        [UIAlertAction actionWithTitle:@"Nope."
-                                 style:UIAlertActionStyleCancel
-                               handler:^(UIAlertAction* action) {
-                                 self.beforeTranslateActionSheet = nil;
-                                 self.translateManager = nil;
-                               }];
-    [_beforeTranslateActionSheet addAction:cancelAction];
+- (void)translationController:(CWVTranslationController*)controller
+    didFinishLanguageDetectionWithResult:(CWVLanguageDetectionResult*)result
+                                   error:(NSError*)error {
+  self.beforeTranslateActionSheet = [UIAlertController
+      alertControllerWithTitle:nil
+                       message:@"Translate?"
+                preferredStyle:UIAlertControllerStyleActionSheet];
+  UIAlertAction* cancelAction =
+      [UIAlertAction actionWithTitle:@"Nope."
+                               style:UIAlertActionStyleCancel
+                             handler:^(UIAlertAction* action) {
+                               self.beforeTranslateActionSheet = nil;
+                             }];
+  [_beforeTranslateActionSheet addAction:cancelAction];
 
-    UIAlertAction* translateAction =
-        [UIAlertAction actionWithTitle:@"Yes!"
-                                 style:UIAlertActionStyleDefault
-                               handler:^(UIAlertAction* action) {
-                                 self.beforeTranslateActionSheet = nil;
-                                 [_translateManager translate];
-                                 self.translateManager = nil;
-                               }];
-    [_beforeTranslateActionSheet addAction:translateAction];
+  UIAlertAction* translateAction = [UIAlertAction
+      actionWithTitle:@"Yes!"
+                style:UIAlertActionStyleDefault
+              handler:^(UIAlertAction* action) {
+                self.beforeTranslateActionSheet = nil;
+                CWVTranslationLanguage* source = result.sourceLanguage;
+                CWVTranslationLanguage* target = result.targetLanguage;
+                [controller translatePageFromLanguage:source toLanguage:target];
+              }];
+  [_beforeTranslateActionSheet addAction:translateAction];
 
-    [[UIApplication sharedApplication].keyWindow.rootViewController
-        presentViewController:_beforeTranslateActionSheet
-                     animated:YES
-                   completion:nil];
-  }
+  [[UIApplication sharedApplication].keyWindow.rootViewController
+      presentViewController:_beforeTranslateActionSheet
+                   animated:YES
+                 completion:nil];
+}
+
+- (void)translationController:(CWVTranslationController*)controller
+    didStartTranslationFromLanguage:(CWVTranslationLanguage*)sourceLanguage
+                         toLanguage:(CWVTranslationLanguage*)targetLanguage {
+}
+
+- (void)translationController:(CWVTranslationController*)controller
+    didFinishTranslationFromLanguage:(CWVTranslationLanguage*)sourceLanguage
+                          toLanguage:(CWVTranslationLanguage*)targetLanguage
+                               error:(NSError*)error {
 }
 
 @end