desks: Add and convert some CHECK to debug continuous gestures.

Test: none
Bug: 1134390
Change-Id: I9d1333178f2b006fec25dcc69e30708df68e5b78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2454373
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814451}

ash/wm/desks/desk_animation_impl.cc

@@ -145,7 +145,8 @@ bool DeskActivationAnimation::UpdateSwipeAnimation(float scroll_delta_x) {
   }
 
   // Activate the target desk and take a screenshot.
-  DCHECK_EQ(pending_animators.size(), desk_switch_animators_.size());
+  // TODO(crbug.com/1134390): Convert back to DCHECK when the issue is fixed.
+  CHECK_EQ(pending_animators.size(), desk_switch_animators_.size());
   ending_desk_index_ = desk_switch_animators_[0]->ending_desk_index();
   PrepareDeskForScreenshot(ending_desk_index_);
   for (auto* animator : pending_animators)

ash/wm/desks/root_window_desk_switch_animator.cc

@@ -320,6 +320,10 @@ bool RootWindowDeskSwitchAnimator::UpdateSwipeAnimation(float scroll_delta_x) {
 }
 
 void RootWindowDeskSwitchAnimator::EndSwipeAnimation() {
+  // TODO(crbug.com/1134390): Convert back to DCHECK when the issue is fixed.
+  CHECK(starting_desk_screenshot_taken_);
+  CHECK(ending_desk_screenshot_taken_);
+
   ending_desk_index_ = GetIndexOfMostVisibleDeskScreenshot();
   StartAnimation();
 }
@@ -577,8 +581,9 @@ int RootWindowDeskSwitchAnimator::GetIndexOfMostVisibleDeskScreenshot() const {
     }
   }
 
-  DCHECK_GE(index, 0);
-  DCHECK_LT(index, int{DesksController::Get()->desks().size()});
+  // TODO(crbug.com/1134390): Convert back to DCHECK when the issue is fixed.
+  CHECK_GE(index, 0);
+  CHECK_LT(index, int{DesksController::Get()->desks().size()});
   return index;
 }