Fix crash when drawing without a program

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 8685 matching lines @@
       fragment_output_type_mask, fragment_output_written_mask)) {
       LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION, func_name,
           "buffer format and fragment output variable type incompatible");
       return false;
   }
   return true;
 }
 
 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);
     if (index > max_index)
       max_index = index;
   }
   if (max_index < 0)
     return true;
   std::vector<GLsizeiptr> uniform_block_sizes(max_index + 1);
   for (int32_t ii = 0; ii <= max_index; ++ii)
@@ skipping 10078 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu