Move WebGL1 attachment image type / attachment point matching check to command buffer.

gpu/command_buffer/service/feature_info.cc

Index: gpu/command_buffer/service/feature_info.cc
diff --git a/gpu/command_buffer/service/feature_info.cc b/gpu/command_buffer/service/feature_info.cc
index 4bd1cdd4f6c1523b1403d30333ed701f08069e07..d8edc1f7f5a5063d94bfea3c2650f8d3cd7cb58d 100644
--- a/gpu/command_buffer/service/feature_info.cc
+++ b/gpu/command_buffer/service/feature_info.cc
@@ -564,6 +564,15 @@ void FeatureInfo::InitializeFeatures() {
           GL_DEPTH_STENCIL);
     }
     validators_.render_buffer_format.AddValue(GL_DEPTH24_STENCIL8);
+    if (context_type_ == CONTEXT_TYPE_WEBGL1) {
+      // For glFramebufferRenderbuffer and glFramebufferTexture2D calls with
+      // attachment == GL_DEPTH_STENCIL_ATTACHMENT, we always split into two
+      // calls, one with attachment == GL_DEPTH_ATTACHMENT, and one with
+      // attachment == GL_STENCIL_ATTACHMENT.  So even if the underlying driver
+      // is ES2 where GL_DEPTH_STENCIL_ATTACHMENT isn't accepted, it is still
+      // OK.
+      validators_.attachment.AddValue(GL_DEPTH_STENCIL_ATTACHMENT);
+    }
   }
 
   if (gl_version_info_->is_es3 ||