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

cc/tiles/tile_manager.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/tiles/tile_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 1377 matching lines @@
 }
 
 const ImageIdFlatSet& TileManager::TakeImagesToInvalidateOnSyncTree() {
   return checker_image_tracker_.TakeImagesToInvalidateOnSyncTree();
 }
 
 void TileManager::DidActivateSyncTree() {
   checker_image_tracker_.DidActivateSyncTree();
 }
 
+void TileManager::ClearCheckerImageTracking() {
+  checker_image_tracker_.ClearTracker();
+}
+
 void TileManager::NeedsInvalidationForCheckerImagedTiles() {
   client_->RequestImplSideInvalidation();
 }
 
 ResourceFormat TileManager::DetermineResourceFormat(const Tile* tile) const {
   return raster_buffer_provider_->GetResourceFormat(!tile->is_opaque());
 }
 
 bool TileManager::DetermineResourceRequiresSwizzle(const Tile* tile) const {
   return raster_buffer_provider_->IsResourceSwizzleRequired(!tile->is_opaque());
@@ skipping 233 matching lines @@
   all_tile_tasks_completed = false;
   did_notify_all_tile_tasks_completed = false;
 }
 
 TileManager::PrioritizedWorkToSchedule::PrioritizedWorkToSchedule() = default;
 TileManager::PrioritizedWorkToSchedule::PrioritizedWorkToSchedule(
     PrioritizedWorkToSchedule&& other) = default;
 TileManager::PrioritizedWorkToSchedule::~PrioritizedWorkToSchedule() = default;
 
 }  // namespace cc