Refactor Context dependency for resolveCompile The context parameter of Shader::resolveCompile method causes a bad impact that many methods in Shader, Program etc. have to have a same context parameter. By removing it, these methods can be decoupled from Context. BUG=chromium:849576 Change-Id: Ia5545ee9dce45794550f6086bc0e6c4707e1276e Reviewed-on: https://chromium-review.googlesource.com/1172202 Commit-Queue: Jie A Chen <jie.a.chen@intel.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>