cc: Interface to evict images from cc image decode cache.

cc/tiles/software_image_decode_cache.h

Index: cc/tiles/software_image_decode_cache.h
diff --git a/cc/tiles/software_image_decode_cache.h b/cc/tiles/software_image_decode_cache.h
index 755770b4bce399aff758e9a5d9a6d86c3980f8f8..6f72b77d6599b8fadf23c1d555f732418997e5ec 100644
--- a/cc/tiles/software_image_decode_cache.h
+++ b/cc/tiles/software_image_decode_cache.h
@@ -142,6 +142,7 @@ class CC_EXPORT SoftwareImageDecodeCache
       bool aggressively_free_resources) override {}
   void ClearCache() override;
   size_t GetMaximumMemoryLimitBytes() const override;
+  void NotifyImageUnused(uint32_t skimage_id) override;
 
   // Decode the given image and store it in the cache. This is only called by an
   // image decode task from a worker thread.