[ios] Added web// public API to let embedder observe loading progress.

ios/web/web_state/web_state_impl_unittest.mm

 // Copyright 2014 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.
 
 #include "ios/web/web_state/web_state_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/values.h"
 #include "ios/web/public/load_committed_details.h"
+#include "ios/web/public/ssl_status.h"
 #include "ios/web/public/test/test_browser_state.h"
 #include "ios/web/public/web_state/global_web_state_observer.h"
+#include "ios/web/public/web_state/web_state_delegate.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #include "ios/web/public/web_state/web_state_policy_decider.h"
 #import "ios/web/test/web_test.h"
 #include "ios/web/web_state/global_web_state_event_tracker.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gtest_mac.h"
 #include "url/gurl.h"
@@ skipping 72 matching lines @@
 
   bool navigation_items_pruned_called_;
   bool navigation_item_changed_called_;
   bool navigation_item_committed_called_;
   bool did_start_loading_called_;
   bool did_stop_loading_called_;
   bool page_loaded_called_with_success_;
   bool web_state_destroyed_called_;
 };
 
+// Test delegate to check that the WebStateDelegate methods are called as
+// expected.
+class TestWebStateDelegate : public WebStateDelegate {
+ public:
+  TestWebStateDelegate() : load_progress_changed_called_(false) {}
+
+  // Methods returning true if the corresponding WebStateObserver method has
+  // been called.
+  bool load_progress_changed_called() const {
+    return load_progress_changed_called_;
+  }
+
+ private:
+  // WebStateObserver implementation:
+  void LoadProgressChanged(WebState* source, double progress) override {
+    load_progress_changed_called_ = true;
+  }
+
+  bool load_progress_changed_called_;
+};
+
 // Test observer to check that the WebStateObserver methods are called as
 // expected.
 class TestWebStateObserver : public WebStateObserver {
  public:
   TestWebStateObserver(WebState* web_state)
       : WebStateObserver(web_state),
         provisional_navigation_started_called_(false),
         navigation_items_pruned_called_(false),
         navigation_item_changed_called_(false),
         navigation_item_committed_called_(false),
@@ skipping 218 matching lines @@
   EXPECT_TRUE(observer->history_state_changed_called());
 
   // Test that WebStateDestroyed() is called.
   EXPECT_FALSE(observer->web_state_destroyed_called());
   web_state_.reset();
   EXPECT_TRUE(observer->web_state_destroyed_called());
 
   EXPECT_EQ(nullptr, observer->web_state());
 }
 
+// Tests that WebStateDelegate methods appropriately called.
+TEST_F(WebStateTest, DelegateTest) {
+  TestWebStateDelegate delegate;
+  web_state_->SetDelegate(&delegate);
+
+  // Test that LoadProgressChanged() is called.
+  EXPECT_FALSE(delegate.load_progress_changed_called());
+  web_state_->SendChangeLoadProgress(0.0);
+  EXPECT_TRUE(delegate.load_progress_changed_called());
+}
+
 // Verifies that GlobalWebStateObservers are called when expected.
 TEST_F(WebStateTest, GlobalObserverTest) {
   std::unique_ptr<TestGlobalWebStateObserver> observer(
       new TestGlobalWebStateObserver());
 
   // Test that NavigationItemsPruned() is called.
   EXPECT_FALSE(observer->navigation_items_pruned_called());
   web_state_->OnNavigationItemsPruned(1);
   EXPECT_TRUE(observer->navigation_items_pruned_called());
 
@@ skipping 137 matching lines @@
   EXPECT_FALSE(
       web_state_->OnScriptCommandReceived(kCommand2, value_2, kUrl2, false));
   EXPECT_FALSE(is_called_1);
   EXPECT_TRUE(is_called_2);
 
   web_state_->RemoveScriptCommandCallback(kPrefix2);
 }
 
 }  // namespace
 }  // namespace web