[core] introduce gfx::RenderPass

src/mbgl/gl/command_encoder.cpp

@@ -1,4 +1,5 @@
 #include <mbgl/gl/command_encoder.hpp>
+#include <mbgl/gl/render_pass.hpp>
 #include <mbgl/gl/context.hpp>
 #include <mbgl/gl/debugging_extension.hpp>
 #include <mbgl/platform/gl_functions.hpp>
@@ -13,6 +14,11 @@ CommandEncoder::~CommandEncoder() {
     context.performCleanup();
 }
 
+std::unique_ptr<gfx::RenderPass>
+CommandEncoder::createRenderPass(const char* name, const gfx::RenderPassDescriptor& descriptor) {
+    return std::make_unique<gl::RenderPass>(*this, name, descriptor);
+}
+
 void CommandEncoder::pushDebugGroup(const char* name) {
     (void)name;
 #ifndef NDEBUG