[UI Refresh] Location bar icons for NTP and Offline pages.

Makes the location bar not show any icon on NTP. Adds a new offline
icon and uses it for offline pages.

Bug: 821804, 845956
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Icd8aba94af4fcabed9c35f3e322312624cb24835
Reviewed-on: https://chromium-review.googlesource.com/1071511
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561899}

ios/chrome/browser/ui/location_bar/BUILD.gn

@@ -28,6 +28,7 @@ source_set("location_bar") {
   ]
   deps = [
     ":constants",
+    "resources:location_bar_offline",
     "resources:location_bar_share",
     "resources:location_bar_voice",
     "//base",

ios/chrome/browser/ui/location_bar/location_bar_mediator.mm

@@ -188,6 +188,14 @@
 #pragma mark Security status icon helpers
 
 - (UIImage*)currentLocationIcon {
+  if (!self.toolbarModel->ShouldDisplayURL()) {
+    return nil;
+  }
+
+  if ([self isCurrentPageOffline]) {
+    return [self imageForOfflinePage];
+  }
+
   return [self imageForSecurityLevel:self.toolbarModel->GetSecurityLevel(true)];
 }
 
@@ -197,4 +205,20 @@
       imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
 }
 
+// Returns a location icon for offline pages.
+- (UIImage*)imageForOfflinePage {
+  return [UIImage imageNamed:@"location_bar_offline"];
+}
+
+- (BOOL)isCurrentPageOffline {
+  if (!self.webState)
+    return false;
+  auto* navigationManager = self.webState->GetNavigationManager();
+  auto* visibleItem = navigationManager->GetVisibleItem();
+  if (!visibleItem)
+    return false;
+  const GURL& url = visibleItem->GetURL();
+  return url.SchemeIs(kChromeUIScheme) && url.host() == kChromeUIOfflineHost;
+}
+
 @end

ios/chrome/browser/ui/location_bar/resources/BUILD.gn

@@ -66,3 +66,12 @@ imageset("location_bar_voice") {
     "location_bar_voice.imageset/location_bar_voice@3x.png",
   ]
 }
+
+imageset("location_bar_offline") {
+  sources = [
+    "location_bar_offline.imageset/Contents.json",
+    "location_bar_offline.imageset/location_bar_offline.png",
+    "location_bar_offline.imageset/location_bar_offline@2x.png",
+    "location_bar_offline.imageset/location_bar_offline@3x.png",
+  ]
+}

ios/chrome/browser/ui/location_bar/resources/location_bar_offline.imageset/Contents.json

+{
+    "images": [
+        {
+            "idiom": "universal",
+            "scale": "1x",
+            "filename": "location_bar_offline.png"
+        },
+        {
+            "idiom": "universal",
+            "scale": "2x",
+            "filename": "location_bar_offline@2x.png"
+        },
+        {
+            "idiom": "universal",
+            "scale": "3x",
+            "filename": "location_bar_offline@3x.png"
+        }
+    ],
+    "info": {
+        "version": 1,
+        "author": "xcode"
+    }
+}