Manually fetch favicons after hash changes.

ios/web/web_state/ui/crw_ui_web_view_web_controller.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.
 
 #import "ios/web/web_state/ui/crw_ui_web_view_web_controller.h"
 
 #import "base/ios/ns_error_util.h"
 #import "base/ios/weak_nsobject.h"
 #include "base/json/json_reader.h"
 #include "base/json/string_escape.h"
@@ skipping 803 matching lines @@
 - (void)webPageChanged {
   if (self.loadPhase != web::LOAD_REQUESTED ||
       self.lastRegisteredRequestURL.is_empty() ||
       self.lastRegisteredRequestURL != [self currentURL]) {
     // The page change was unexpected (not already messaged to
     // webWillStartLoadingURL), so fill in the load request.
     [self generateMissingLoadRequestWithURL:[self currentURL]
                                    referrer:[self currentReferrer]];
   }
 
+  // Fetch the favicons for the new page.
+  // TODO(kkhorimoto): Consolidate favicon fetching into a single location.
+  // http://crbug.com/534573
+  NSString *const kGetFaviconsScript =
+       @"__gCrWeb.message.invokeOnHost("

[Eugene But (OOO till 7-30), 2015/09/21 21:32:43]

This approach is very fragile and will break if f.e. invokeOnHost will be
renamed. How about adding a public function to web JS?

[kkhorimoto, 2016/01/30 00:47:01]

Done.

+       "    {'command' : 'document.favicons',"
+       "     'favicons': __gCrWeb.common.getFavicons()});";
+  web::EvaluateJavaScript(_uiWebView, kGetFaviconsScript, nil);
+
   [super webPageChanged];
 }
 
 - (void)applyWebViewScrollZoomScaleFromZoomState:
     (const web::PageZoomState&)zoomState {
   // A UIWebView's scroll view uses zoom scales in a non-standard way.  The
   // scroll view's |zoomScale| property is always equal to 1.0, and the
   // |minimumZoomScale| and |maximumZoomScale| properties are adjusted
   // proportionally to reflect the relative zoom scale.  Setting the |zoomScale|
   // property here scales the page by the value set (i.e. setting zoomScale to
@@ skipping 720 matching lines @@
 }
 
 #pragma mark -
 #pragma mark Testing methods
 
 -(id<CRWRecurringTaskDelegate>)recurringTaskDelegate {
   return _recurringTaskDelegate;
 }
 
 @end