[core] add gfx::CommandEncoder::present()

src/mbgl/gl/command_encoder.cpp

@@ -1,6 +1,7 @@
 #include <mbgl/gl/command_encoder.hpp>
 #include <mbgl/gl/render_pass.hpp>
 #include <mbgl/gl/context.hpp>
+#include <mbgl/gl/renderable_resource.hpp>
 #include <mbgl/gl/debugging_extension.hpp>
 #include <mbgl/platform/gl_functions.hpp>
 
@@ -19,6 +20,10 @@ CommandEncoder::createRenderPass(const char* name, const gfx::RenderPassDescript
     return std::make_unique<gl::RenderPass>(*this, name, descriptor);
 }
 
+void CommandEncoder::present(gfx::Renderable& renderable) {
+    renderable.getResource<gl::RenderableResource>().swap();
+}
+
 void CommandEncoder::pushDebugGroup(const char* name) {
     (void)name;
 #ifndef NDEBUG