Implement native GMB backbuffers in the GLES2 Command Decoder.

gpu/gles2_conform_support/egl/context.cc

Index: gpu/gles2_conform_support/egl/context.cc
diff --git a/gpu/gles2_conform_support/egl/context.cc b/gpu/gles2_conform_support/egl/context.cc
index 63d851c0d43fce709623edb18d0bdc20590c8a66..ec625f122ede18bbd7955c40704d944eb7710d8f 100644
--- a/gpu/gles2_conform_support/egl/context.cc
+++ b/gpu/gles2_conform_support/egl/context.cc
@@ -264,7 +264,8 @@ bool Context::CreateService(gl::GLSurface* gl_surface) {
   scoped_refptr<gpu::gles2::ContextGroup> group(new gpu::gles2::ContextGroup(
       gpu_preferences_, nullptr, nullptr,
       new gpu::gles2::ShaderTranslatorCache(gpu_preferences_),
-      new gpu::gles2::FramebufferCompletenessCache, feature_info, true));
+      new gpu::gles2::FramebufferCompletenessCache, feature_info, true,
+      nullptr));
 
   std::unique_ptr<gpu::gles2::GLES2Decoder> decoder(
       gpu::gles2::GLES2Decoder::Create(group.get()));