Avoid TabGroupModelFilter casting exception(2)

This is a follow up of crrev.com/c/2442479. This CL early returns when
TabModelFilterProvider().getTabModelFilter() is not a
TabGroupModelFilter to avoid the casting exception in
TabGroupUiCoordinator.recordSessionCount().

This CL is gated by Finch parameter "enable_launch_polish" under flag
"enable-tab-grid-layout", with gate function
TabUiFeatureUtilities#isLaunchPolishEnabled.

Bug: 1133922
Change-Id: I830b6721e15b6ca558e79b66dcd7a1b783186f7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443395Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Mei Liang <meiliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812903}

chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabGroupUiCoordinator.java

@@ -255,6 +255,23 @@ public class TabGroupUiCoordinator implements TabGroupUiMediator.ResetHandler, T
     }
 
     private void recordSessionCount() {
+        if (TabUiFeatureUtilities.isLaunchPolishEnabled()) {
+            TabModelFilter normalTabModelFilter =
+                    mActivity.getTabModelSelector().getTabModelFilterProvider().getTabModelFilter(
+                            false);
+
+            if (!(normalTabModelFilter instanceof TabGroupModelFilter)) {
+                String actualType = normalTabModelFilter == null
+                        ? "null"
+                        : normalTabModelFilter.getClass().getName();
+                assert false
+                    : "Please file bug, this is unexpected. Expected TabGroupModelFilter, but was "
+                      + actualType;
+
+                return;
+            }
+        }
+
         OverviewModeBehavior overviewModeBehavior =
                 (OverviewModeBehavior) mActivity.getOverviewModeBehaviorSupplier().get();