Added -[CRWWKNavigationStates pendingNavigations] API.

ios/web/web_state/ui/crw_wk_navigation_states_unittest.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"
 
 #import <WebKit/WebKit.h>
 
 #import "base/mac/scoped_nsobject.h"
 #include "ios/web/web_state/navigation_context_impl.h"
@@ skipping 111 matching lines @@
   [states_ setState:WKNavigationState::STARTED forNavigation:nil];
   EXPECT_FALSE([states_ lastAddedNavigation]);
   EXPECT_EQ(WKNavigationState::STARTED, [states_ lastAddedNavigationState]);
 
   // navigation_1 is the latest again after removing null navigation.
   [states_ removeNavigation:nil];
   ASSERT_EQ(navigation1_, [states_ lastAddedNavigation]);
   EXPECT_EQ(WKNavigationState::REQUESTED, [states_ lastAddedNavigationState]);
 }
 
+// Tests -[CRWWKNavigationStates pendingNavigations].
+TEST_F(CRWWKNavigationStatesTest, PendingNavigations) {
+  ASSERT_EQ(0U, [states_ pendingNavigations].count);
+
+  // Add pending navigation_1.
+  [states_ setState:WKNavigationState::REQUESTED forNavigation:navigation1_];
+  ASSERT_EQ(1U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation1_]);
+
+  // Add pending navigation_2.
+  [states_ setState:WKNavigationState::STARTED forNavigation:navigation2_];
+  ASSERT_EQ(2U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation1_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation2_]);
+
+  // Add pending navigation_3.
+  [states_ setState:WKNavigationState::STARTED forNavigation:navigation3_];
+  ASSERT_EQ(3U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation1_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation2_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+
+  // Add pending null navigation.
+  [states_ setState:WKNavigationState::STARTED forNavigation:nil];
+  ASSERT_EQ(4U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation1_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation2_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:[NSNull null]]);
+
+  // Provisionally fail null navigation.
+  [states_ setState:WKNavigationState::PROVISIONALY_FAILED forNavigation:nil];
+  ASSERT_EQ(3U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation2_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+
+  // Commit navigation_1.
+  [states_ setState:WKNavigationState::COMMITTED forNavigation:navigation1_];
+  ASSERT_EQ(2U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation2_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+
+  // Finish navigation_1.
+  [states_ setState:WKNavigationState::FINISHED forNavigation:navigation1_];
+  ASSERT_EQ(2U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation2_]);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+
+  // Remove navigation_2.
+  [states_ removeNavigation:navigation2_];
+  ASSERT_EQ(1U, [states_ pendingNavigations].count);
+  EXPECT_TRUE([[states_ pendingNavigations] containsObject:navigation3_]);
+
+  // Fail navigation_3.
+  [states_ setState:WKNavigationState::FAILED forNavigation:navigation3_];
+  ASSERT_EQ(0U, [states_ pendingNavigations].count);
+}
+
 }  // namespace web