[temporary M30 fix] Disable dragging tabs with web contents modal dialogs displayed

chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc

Index: chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
diff --git a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
index 6aedb9ba6d02c19f0f570164632434466a3178d8..b9ad12f6a8568d0a785eb19c571c45294f441f9b 100644
--- a/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
+++ b/chrome/browser/ui/views/tabs/browser_tab_strip_controller.cc
@@ -26,6 +26,7 @@
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
+#include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
@@ -38,6 +39,7 @@
 
 using content::UserMetricsAction;
 using content::WebContents;
+using web_modal::WebContentsModalDialogManager;
 
 namespace {
 
@@ -364,6 +366,15 @@ void BrowserTabStripController::LayoutTypeMaybeChanged() {
       static_cast<int>(tabstrip_->layout_type()));
 }
 
+bool BrowserTabStripController::IsTabShowingWebViewModalDialog(int index) {
+  DCHECK(model_->ContainsIndex(index));
+  WebContentsModalDialogManager* contents_modal_dialog_manager =
+      WebContentsModalDialogManager::FromWebContents(
+          model_->GetWebContentsAt(index));
+  return contents_modal_dialog_manager &&
+      contents_modal_dialog_manager->IsShowingDialog();
+}
+
 void BrowserTabStripController::OnStartedDraggingTabs() {
   BrowserView* browser_view = BrowserView::GetBrowserViewForBrowser(browser_);
   if (browser_view && !immersive_reveal_lock_.get()) {