[ios clean] Consumer interface for WebContents

ios/clean/chrome/browser/ui/web_contents/web_contents_mediator.mm

+// Copyright 2017 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/clean/chrome/browser/ui/web_contents/web_contents_mediator.h"
+
+#import "ios/clean/chrome/browser/ui/web_contents/web_contents_consumer.h"
+#import "ios/web/public/navigation_manager.h"
+#include "ios/web/public/web_state/web_state.h"
+#include "ui/base/page_transition_types.h"
+#include "url/gurl.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation WebContentsMediator
+@synthesize webState = _webState;
+@synthesize consumer = _consumer;
+
+- (void)setWebState:(web::WebState*)webState {
+  if (_webState)
+    _webState->SetWebUsageEnabled(false);
+
+  _webState = webState;
+  if (!self.webState)
+    return;
+
+  self.webState->SetWebUsageEnabled(true);
+  if (!self.webState->GetNavigationManager()->GetItemCount()) {
+    web::NavigationManager::WebLoadParams params(
+        GURL("https://dev.chromium.org/"));
+    params.transition_type = ui::PAGE_TRANSITION_TYPED;
+    self.webState->GetNavigationManager()->LoadURLWithParams(params);
+  }
+  [self.consumer contentViewDidChange:self.webState->GetView()];
+}
+
+- (void)setConsumer:(id<WebContentsConsumer>)consumer {
+  _consumer = consumer;
+  if (self.webState)
+    [self.consumer contentViewDidChange:self.webState->GetView()];
+}
+
+@end