[iOS] Add Request Mobile Site cell to tools menu

ios/chrome/browser/ui/browser_view_controller.mm

Index: ios/chrome/browser/ui/browser_view_controller.mm
diff --git a/ios/chrome/browser/ui/browser_view_controller.mm b/ios/chrome/browser/ui/browser_view_controller.mm
index 9b3b3afa3ff9a8cbe9cf40f7fc6d4b47c8adb8b0..967cd59b773616b83dd18ea41fc75b95ce565c16 100644
--- a/ios/chrome/browser/ui/browser_view_controller.mm
+++ b/ios/chrome/browser/ui/browser_view_controller.mm
@@ -516,6 +516,8 @@ @interface BrowserViewController ()<AppRatingPromptDelegate,
 @property(nonatomic, assign, readonly) BOOL canUseReaderMode;
 // Whether the current tab can enable the request desktop menu item.
 @property(nonatomic, assign, readonly) BOOL canUseDesktopUserAgent;
+// Whether the current tab can enable the request mobile menu item.
+@property(nonatomic, assign, readonly) BOOL canUseMobileUserAgent;
 // Whether the sharing menu should be enabled.
 @property(nonatomic, assign, readonly) BOOL canShowShareMenu;
 // Helper method to check web controller canShowFindBar method.
@@ -625,8 +627,17 @@ - (void)dismissRateThisAppDialog;
 // Shows the source of the current page.
 - (void)viewSource;
 #endif
-// Whether the given tab's url begins with the chrome prefix.
-- (BOOL)isTabNativePage:(Tab*)tab;
+
+// True if "Request Desktop Site" should be visible in tools menu, otherwise,
+// make "Request Mobile Site" visible.
+- (BOOL)shouldShowRequestDesktopSite;
+
+// Whether the current tab is using desktop user agent.
+- (BOOL)isCurrentTabUsingDesktopUserAgent;
+
+// Whether the current tab's url begins with the chrome prefix.
+- (BOOL)isCurrentTabNativePage;
+
 // Returns the view to use when animating a page in or out, positioning it to
 // fill the content area but not actually adding it to the view hierarchy.
 - (UIImageView*)pageOpenCloseAnimationView;
@@ -683,8 +694,13 @@ - (CardView*)addCardViewInFullscreen:(BOOL)fullScreen;
 - (void)tabLoadComplete:(Tab*)tab withSuccess:(BOOL)success;
 // Evaluates Javascript asynchronously using the current page context.
 - (void)openJavascript:(NSString*)javascript;
+
 // Sets the desktop user agent flag and reload the current page.
-- (void)enableDesktopUserAgent;
+- (void)reloadPageWithDesktopUserAgent;
+
+// Sets the mobile user agent flag and reload the current page.
+- (void)reloadPageWithMobileUserAgent;
+
 // Helper methods used by ShareToDelegate methods.
 // Shows an alert with the given title and message id.
 - (void)showErrorAlert:(int)titleMessageId message:(int)messageId;
@@ -1063,13 +1079,27 @@ - (BOOL)canUseReaderMode {
   return [tab canSwitchToReaderMode];
 }
 
+- (BOOL)shouldShowRequestDesktopSite {
+  return [self isCurrentTabNativePage] ||
+         ![self isCurrentTabUsingDesktopUserAgent];
+}
+
 - (BOOL)canUseDesktopUserAgent {
-  Tab* tab = [_model currentTab];
-  if ([self isTabNativePage:tab])
-    return NO;
+  return ![self isCurrentTabNativePage] &&
+         ![self isCurrentTabUsingDesktopUserAgent];
+}
+
+- (BOOL)canUseMobileUserAgent {
+  return ![self isCurrentTabNativePage] &&
+         [self isCurrentTabUsingDesktopUserAgent];
+}
 
-  // If |useDesktopUserAgent| is |NO|, allow useDesktopUserAgent.
-  return !tab.usesDesktopUserAgent;
+- (BOOL)isCurrentTabNativePage {
+  return [self isTabNativePage:[_model currentTab]];
+}
+
+- (BOOL)isCurrentTabUsingDesktopUserAgent {
+  return [_model currentTab].usesDesktopUserAgent;
 }
 
 // Whether the sharing menu should be shown.
@@ -3289,12 +3319,20 @@ - (void)showToolsMenuPopup {
   ToolsPopupController* toolsPopupController =
       [_toolbarController toolsPopupController];
   if ([_model currentTab]) {
+    // Both "Request Desktop Site" and "Request Mobile Site" are visible by
+    // default, needs to hide exactly one of them.
+    if ([self shouldShowRequestDesktopSite])
+      [toolsPopupController hideRequestMobileSite];
+    else
+      [toolsPopupController hideRequestDesktopSite];
+
     BOOL isBookmarked = _toolbarModelIOS->IsCurrentTabBookmarked();
     [toolsPopupController setIsCurrentPageBookmarked:isBookmarked];
     [toolsPopupController setCanShowFindBar:self.canShowFindBar];
     [toolsPopupController setCanUseReaderMode:self.canUseReaderMode];
     [toolsPopupController
         setCanUseDesktopUserAgent:self.canUseDesktopUserAgent];
+    [toolsPopupController setCanUseMobileUserAgent:self.canUseMobileUserAgent];
     [toolsPopupController setCanShowShareMenu:self.canShowShareMenu];
 
     if (!IsIPadIdiom())
@@ -3926,7 +3964,10 @@ - (IBAction)chromeExecuteCommand:(id)sender {
       [[_model currentTab] switchToReaderMode];
       break;
     case IDC_REQUEST_DESKTOP_SITE:
-      [self enableDesktopUserAgent];
+      [self reloadPageWithDesktopUserAgent];
+      break;
+    case IDC_REQUEST_MOBILE_SITE:
+      [self reloadPageWithMobileUserAgent];
       break;
     case IDC_SHOW_TOOLS_MENU: {
       [self showToolsMenuPopup];
@@ -4135,9 +4176,12 @@ - (void)showHelpPage {
                   appendTo:kCurrentTab];
 }
 
-- (void)enableDesktopUserAgent {
-  [[_model currentTab] enableDesktopUserAgent];
-  [[_model currentTab] reloadForDesktopUserAgent];
+- (void)reloadPageWithDesktopUserAgent {
+  [[_model currentTab] activateDesktopUserAgent];
+  [[_model currentTab] reloadForUpdatedUserAgent];
+}
+
+- (void)reloadPageWithMobileUserAgent {
 }
 
 - (void)resetAllWebViews {