Fix crash when drawing without a program

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index c032dff22ae14ad9a95fdad3815abc464779af5b..c480b71567dca3814c19aeca0b4f7185bc338e42 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -8703,7 +8703,8 @@ bool GLES2DecoderImpl::ValidateAndAdjustDrawBuffers(const char* func_name) {
 
 bool GLES2DecoderImpl::ValidateUniformBlockBackings(const char* func_name) {
   DCHECK(feature_info_->IsWebGL2OrES3Context());
-  DCHECK(state_.current_program.get());
+  if (!state_.current_program.get())
+    return true;
   int32_t max_index = -1;
   for (auto info : state_.current_program->uniform_block_size_info()) {
     int32_t index = static_cast<int32_t>(info.binding);