Use ui::PAGE_TRANSITION_RELOAD transition for web page reload.

ios/web/web_state/ui/crw_web_controller.mm

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 2034 matching lines @@
         self.navigationManagerImpl->GetTransientItem();
     if (transientItem) {
       // If there's a transient item, a reload is considered a new navigation to
       // the transient item's URL (as on other platforms).
       NavigationManager::WebLoadParams reloadParams(transientItem->GetURL());
       reloadParams.transition_type = ui::PAGE_TRANSITION_RELOAD;
       reloadParams.extra_headers.reset(
           [transientItem->GetHttpRequestHeaders() copy]);
       [self loadWithParams:reloadParams];
     } else {
-      // As with back and forward navigation, load the URL manually instead of
-      // using the web view's reload. This ensures state processing and delegate

[Eugene But (OOO till 7-30), 2017/05/25 17:10:08]

This is not true for WKWebView. |loadCurrentURL| will eventually call
-[WKWebView reload]

-      // calls are consistent.
-      // TODO(eugenebut): revisit this for WKWebView.
+      self.currentNavItem->SetTransitionType(
+          ui::PageTransition::PAGE_TRANSITION_RELOAD);

[kkhorimoto, 2017/05/26 17:32:42]

Is this what's done in content// as well?  It seems weird that we love the
previous page transition type upon reloading.  I checked, and it looks like
RELOAD is not a bitwise enum, so we can't combine with the previous value, but
do they actually reset the NavigationEntry's transition type, or do they just
pass the RELOAD type around to interested functions?

[Eugene But (OOO till 7-30), 2017/05/26 17:48:32]

I'm pretty sure they reset navigation to reload which makes total sense to me:
https://cs.chromium.org/chromium/src/content/browser/frame_host/navigation_co...

       [self loadCurrentURL];
     }
   }
 }
 
 - (void)reload {
   [_delegate webWillReload];
   [self reloadInternal];
 }
 
@@ skipping 3172 matching lines @@
 - (NSUInteger)observerCount {
   DCHECK_EQ(_observerBridges.size(), [_observers count]);
   return [_observers count];
 }
 
 - (NSString*)referrerFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:kReferrerHeaderName];
 }
 
 @end