Add help link when Bluetooth adapter is off for WebBluetooth chooser on Mac

chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm

Index: chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm b/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
index c0030750b591c449c97352ca402ac007382f6569..dcf94cb9a6a0592e9e5377fd76d9460f3f6f5f61 100644
--- a/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
+++ b/chrome/browser/ui/cocoa/chooser_content_view_cocoa.mm
@@ -60,6 +60,9 @@ const CGFloat kSeparatorHeight = 1.0f;
 const CGFloat kTableRowViewHorizontalPadding = 5.0f;
 const CGFloat kTableRowViewVerticalPadding = 1.0f;
 
+// Distance between the adapter off help link and the scroll view boundaries.
+const CGFloat kAdapterOffHelpLinkPadding = 5.0f;
+
 // The lookup table for signal strength level image.
 const int kSignalStrengthLevelImageIds[5] = {IDR_SIGNAL_0_BAR, IDR_SIGNAL_1_BAR,
                                              IDR_SIGNAL_2_BAR, IDR_SIGNAL_3_BAR,
@@ -233,6 +236,7 @@ class ChooserContentViewController : public ChooserController::View {
  public:
   ChooserContentViewController(ChooserContentViewCocoa* chooser_content_view,
                                ChooserController* chooser_controller,
+                               NSButton* adapter_off_help_button,
                                NSTableView* table_view,
                                SpinnerView* spinner,
                                NSTextField* status,
@@ -252,6 +256,7 @@ class ChooserContentViewController : public ChooserController::View {
  private:
   ChooserContentViewCocoa* chooser_content_view_;
   ChooserController* chooser_controller_;
+  NSButton* adapter_off_help_button_;
   NSTableView* table_view_;
   SpinnerView* spinner_;
   NSTextField* status_;
@@ -263,17 +268,20 @@ class ChooserContentViewController : public ChooserController::View {
 ChooserContentViewController::ChooserContentViewController(
     ChooserContentViewCocoa* chooser_content_view,
     ChooserController* chooser_controller,
+    NSButton* adapter_off_help_button,
     NSTableView* table_view,
     SpinnerView* spinner,
     NSTextField* status,
     NSButton* rescan_button)
     : chooser_content_view_(chooser_content_view),
       chooser_controller_(chooser_controller),
+      adapter_off_help_button_(adapter_off_help_button),
       table_view_(table_view),
       spinner_(spinner),
       status_(status),
       rescan_button_(rescan_button) {
   DCHECK(chooser_controller_);
+  DCHECK(adapter_off_help_button_);
   DCHECK(table_view_);
   DCHECK(spinner_);
   DCHECK(status_);
@@ -324,7 +332,8 @@ void ChooserContentViewController::OnAdapterEnabledChanged(bool enabled) {
   // of a previously selected row.
   [table_view_ deselectAll:nil];
   UpdateTableView();
-  [table_view_ setHidden:NO];
+  [table_view_ setHidden:enabled ? NO : YES];
+  [adapter_off_help_button_ setHidden:enabled ? YES : NO];
 
   [spinner_ setHidden:YES];
 
@@ -409,6 +418,14 @@ void ChooserContentViewController::UpdateTableView() {
     titleView_ = [self createChooserTitle:chooserTitle];
     titleHeight_ = NSHeight([titleView_ frame]);
 
+    // Adapter turned off help button.
+    adapterOffHelpButton_ =
+        [self createHyperlinkButtonWithText:
+                  l10n_util::GetNSString(
+                      IDS_BLUETOOTH_DEVICE_CHOOSER_TURN_ADAPTER_OFF)];
+    CGFloat adapterOffHelpButtonHeight =
+        NSHeight([adapterOffHelpButton_ frame]);
+
     // Status.
     status_ = CreateLabel(
         l10n_util::GetNSString(IDS_BLUETOOTH_DEVICE_CHOOSER_SCANNING));
@@ -460,6 +477,7 @@ void ChooserContentViewController::UpdateTableView() {
     [scrollView_ setHasVerticalScroller:YES];
     [scrollView_ setHasHorizontalScroller:YES];
     [scrollView_ setAutohidesScrollers:YES];
+    [scrollView_ setDrawsBackground:NO];
 
     // TableView.
     tableView_.reset([[NSTableView alloc] initWithFrame:NSZeroRect]);
@@ -497,6 +515,19 @@ void ChooserContentViewController::UpdateTableView() {
     [titleView_ setFrameOrigin:NSMakePoint(titleOriginX, titleOriginY)];
     [self addSubview:titleView_];
 
+    // Adapter turned off help button.
+    CGFloat adapterOffHelpButtonOriginX = kMarginX + kAdapterOffHelpLinkPadding;
+    CGFloat adapterOffHelpButtonOriginY = titleOriginY - kVerticalPadding -
+                                          adapterOffHelpButtonHeight -
+                                          kAdapterOffHelpLinkPadding;
+    [adapterOffHelpButton_
+        setFrameOrigin:NSMakePoint(adapterOffHelpButtonOriginX,
+                                   adapterOffHelpButtonOriginY)];
+    [adapterOffHelpButton_ setTarget:self];
+    [adapterOffHelpButton_ setAction:@selector(onAdapterOffHelp:)];
+    [adapterOffHelpButton_ setHidden:YES];
+    [self addSubview:adapterOffHelpButton_];
+
     // ScollView and Spinner. Only one of them is shown.
     [scrollView_ setDocumentView:tableView_];
     [self addSubview:scrollView_];
@@ -566,8 +597,8 @@ void ChooserContentViewController::UpdateTableView() {
     rescanButtonOrigin_ = [self calculateRescanButtonOrigin:buttonRowHeight];
 
     chooserContentViewController_.reset(new ChooserContentViewController(
-        self, chooserController_.get(), tableView_.get(), spinner_.get(),
-        status_.get(), rescanButton_.get()));
+        self, chooserController_.get(), adapterOffHelpButton_.get(),
+        tableView_.get(), spinner_.get(), status_.get(), rescanButton_.get()));
   }
 
   return self;
@@ -735,6 +766,10 @@ void ChooserContentViewController::UpdateTableView() {
   [cancelButton_ setFrameOrigin:frameAndOrigin.cancel_button_origin];
 }
 
+- (NSButton*)adapterOffHelpButton {
+  return adapterOffHelpButton_.get();
+}
+
 - (NSTableView*)tableView {
   return tableView_.get();
 }
@@ -803,6 +838,10 @@ void ChooserContentViewController::UpdateTableView() {
   chooserController_->Close();
 }
 
+- (void)onAdapterOffHelp:(id)sender {
+  chooserController_->OpenAdapterOffHelpUrl();
+}
+
 - (void)onRescan:(id)sender {
   chooserController_->RefreshOptions();
 }