[raster_cache] Increment access_count on Touch (flutter#29529)

Author: iskakaushik

flow/raster_cache.cc

@@ -324,6 +324,7 @@ void RasterCache::Touch(Layer* layer, const SkMatrix& ctm) {
  auto it = layer_cache_.find(cache_key);
  if (it != layer_cache_.end()) {
  it->second.used_this_frame = true;
+ it->second.access_count++;
  }
 }
 
@@ -333,6 +334,7 @@ void RasterCache::Touch(SkPicture* picture,
  auto it = picture_cache_.find(cache_key);
  if (it != picture_cache_.end()) {
  it->second.used_this_frame = true;
+ it->second.access_count++;
  }
 }
 
@@ -343,6 +345,7 @@ void RasterCache::Touch(DisplayList* display_list,
  auto it = display_list_cache_.find(cache_key);
  if (it != display_list_cache_.end()) {
  it->second.used_this_frame = true;
+ it->second.access_count++;
  }
 }