cc: Free gpu resources when we are invisible or TM is oom.

cc/resources/rasterizer.h

Index: cc/resources/rasterizer.h
diff --git a/cc/resources/rasterizer.h b/cc/resources/rasterizer.h
index 43df0b0c3d9ba9c4db27e354b6271a0322fe2bbc..7ff66b9b82e801d73e950f47f10ba6ee8e9468f6 100644
--- a/cc/resources/rasterizer.h
+++ b/cc/resources/rasterizer.h
@@ -34,6 +34,8 @@ class CC_EXPORT Rasterizer {
       ResourcePool* resource_pool,
       ResourceFormat resource_format,
       const UpdateTileDrawInfoCallback& update_tile_draw_info) = 0;
+  virtual void SetZeroMemoryLimit() = 0;
+  virtual void SetDefaultMemoryLimit() = 0;
 
  protected:
   Rasterizer() {}