[iOS] Add experimental new keyboard accessory view.

ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h

Index: ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h
diff --git a/ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h b/ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h
index a33130490ff72bc36daab243121420c0ae568802..5c27a5665daec1053335978c8a6288476ed53099 100644
--- a/ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h
+++ b/ios/chrome/browser/ui/toolbar/keyboard_accessory_view.h
@@ -16,6 +16,10 @@
 // Notifies the delegate that a touch up occured in the the Voice Search button.
 - (void)keyboardAccessoryVoiceSearchTouchUpInside;
 
+// Notifies the delegate that a touch up occured in the the Camera Search
+// button.
+- (void)keyboardAccessoryCameraSearchTouchUpInside;
+
 // Notifies the delegate that a key with the title |title| was pressed.
 - (void)keyPressed:(NSString*)title;