Initialize buffers before allowing access to them.

gpu/command_buffer/service/indexed_buffer_binding_host.cc

 // Copyright (c) 2016 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/indexed_buffer_binding_host.h"
 
 #include "gpu/command_buffer/service/buffer_manager.h"
 
 namespace gpu {
 namespace gles2 {
@@ skipping 246 matching lines @@
       for (size_t ii = changed_index; ii > 0; --ii) {
         if (buffer_bindings_[ii - 1].buffer.get()) {
           max_non_null_binding_index_plus_one_ = ii;
           break;
         }
       }
     }
   }
 }
 
+bool IndexedBufferBindingHost::UsesBuffer(
+    size_t used_binding_count, const Buffer* buffer) const {
+  DCHECK(buffer);
+  DCHECK_LE(used_binding_count, buffer_bindings_.size());
+  for (size_t ii = 0; ii < used_binding_count; ++ii) {
+    if (buffer == buffer_bindings_[ii].buffer)
+      return true;
+  }
+  return false;
+}
+
 }  // namespace gles2
 }  // namespace gpu