cc: Clear checker-image tracking on navigation and visibility changes.

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index 1c78b5353496048ab7f3c8f64d671522631592e8..dd45d3a40729f3a9ed42be261872c22ecc68b5d4 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -1395,6 +1395,11 @@ void TileManager::DidActivateSyncTree() {
   checker_image_tracker_.DidActivateSyncTree();
 }
 
+void TileManager::ClearCheckerImageTracking(
+    bool can_clear_decode_policy_tracking) {
+  checker_image_tracker_.ClearTracker(can_clear_decode_policy_tracking);
+}
+
 void TileManager::NeedsInvalidationForCheckerImagedTiles() {
   client_->RequestImplSideInvalidation();
 }