Added -[CRWWKNavigationStates pendingNavigations] API.

ios/web/web_state/ui/crw_wk_navigation_states.mm

 // Copyright 2016 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_wk_navigation_states.h"
 
 #include "base/logging.h"
 #include "ios/web/web_state/navigation_context_impl.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
@@ skipping 152 matching lines @@
   return result;
 }
 
 - (web::WKNavigationState)lastAddedNavigationState {
   CRWWKNavigationsStateRecord* result = nil;
   WKNavigation* unused = nil;
   [self getLastAddedNavigation:&unused record:&result];
   return result.state;
 }
 
+- (NSSet*)pendingNavigations {
+  NSMutableSet* result = [NSMutableSet set];
+  for (id navigation in _records) {
+    CRWWKNavigationsStateRecord* record = [_records objectForKey:navigation];
+    if (record.state == web::WKNavigationState::REQUESTED ||
+        record.state == web::WKNavigationState::STARTED ||
+        record.state == web::WKNavigationState::REDIRECTED) {
+      [result addObject:navigation];
+    }
+  }
+  return [result copy];
+}
+
 - (id)keyForNavigation:(WKNavigation*)navigation {
   return navigation ? navigation : _nullNavigation;
 }
 
 - (void)getLastAddedNavigation:(WKNavigation**)outNavigation
                         record:(CRWWKNavigationsStateRecord**)outRecord {
   NSUInteger lastAddedIndex = 0;  // record indices start with 1.
   for (WKNavigation* navigation in _records) {
     CRWWKNavigationsStateRecord* record = [_records objectForKey:navigation];
     if (lastAddedIndex < record.index) {
       *outNavigation = navigation;
       *outRecord = record;
       lastAddedIndex = record.index;
     }
   }
 
   if (*outNavigation == _nullNavigation) {
     // |_nullNavigation| is a key for storing null navigations.
     *outNavigation = nil;
   }
 }
 
 @end