[ios] Present Infobar modal when tapping on Translate badge

Bug: 1014959
Change-Id: I3504b83034008c12bd66a02b01154395484e919d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888100
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710792}

ios/chrome/browser/ui/badges/badge_mediator.mm

@@ -141,7 +141,12 @@ const int kMinimumNonFullScreenBadgesForOverflow = 2;
 }
 
 - (void)translateBadgeButtonTapped:(id)sender {
-  // TODO(crbug.com/1014959): Implement.
+  BadgeButton* badgeButton = base::mac::ObjCCastStrict<BadgeButton>(sender);
+  DCHECK_EQ(badgeButton.badgeType, BadgeType::kBadgeTypeTranslate);
+
+  [self.dispatcher displayModalInfobar:InfobarType::kInfobarTypeTranslate];
+  [self recordMetricsForBadgeButton:badgeButton
+                        infobarType:InfobarType::kInfobarTypeTranslate];
 }
 
 - (void)overflowBadgeButtonTapped:(id)sender {