Got rid of empty steps in graphics replay.
Got rid of empty steps in graphics replay.

Removed steps with no WebGL-related events from graphics replay. Previously, the playback sometimes paused at steps with no visible events, which is not useful.

mcanthony/tracing-framework,feisuo/tracing-framework,lollerbus/tracing-framework,dockbiz/tracing-framework,feisuo/tracing-framework,dockbiz/tracing-framework,feisuo/tracing-framework,looker/tracing-framework,zhaoz/tracing-framework,vinodpanicker/tracing-framework,mcanthony/tracing-framework,lollerbus/tracing-framework,looker/tracing-framework,looker/tracing-framework,dockbiz/tracing-framework,vinodpanicker/tracing-framework,lollerbus/tracing-framework,vinodpanicker/tracing-framework,mcanthony/tracing-framework,google/tracing-framework,lollerbus/tracing-framework,looker/tracing-framework,mcanthony/tracing-framework,vinodpanicker/tracing-framework,zhaoz/tracing-framework,zhaoz/tracing-framework,zhaoz/tracing-framework,google/tracing-framework,google/tracing-framework,dockbiz/tracing-framework,google/tracing-framework,feisuo/tracing-framework