Add a flag to disable partial raster in renderer

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index 95a8c80cb83f781ac250d2f91ae2f7b9d5d5f1cb..e6d467f9122927af92f24088955f3ccd5e495ee7 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -72,7 +72,7 @@ class CC_EXPORT LayerTreeSettings {
   size_t max_memory_for_prepaint_percentage;
   bool strict_layer_property_change_checking;
   bool use_zero_copy;
-  bool use_persistent_map_for_gpu_memory_buffers;
+  bool use_partial_raster;
   bool enable_elastic_overscroll;
   // An array of image texture targets for each GpuMemoryBuffer format.
   std::vector<unsigned> use_image_texture_targets;