Allow creating GLImage-backed textures with glTexStorage2D.

gpu/command_buffer/service/gles2_cmd_validation_autogen.h

Index: gpu/command_buffer/service/gles2_cmd_validation_autogen.h
diff --git a/gpu/command_buffer/service/gles2_cmd_validation_autogen.h b/gpu/command_buffer/service/gles2_cmd_validation_autogen.h
index 408759a10904d33c538c6e7f55458e170f01e36d..ac219e4d0154ba75d63b5dc5d0302c5af517acca 100644
--- a/gpu/command_buffer/service/gles2_cmd_validation_autogen.h
+++ b/gpu/command_buffer/service/gles2_cmd_validation_autogen.h
@@ -317,6 +317,12 @@ class Texture3DTargetValidator {
 Texture3DTargetValidator texture_3_d_target;
 
 ValueValidator<GLenum> texture_bind_target;
+class TextureBufferUsageValidator {
+ public:
+  bool IsValid(const GLenum value) const;
+};
+TextureBufferUsageValidator texture_buffer_usage;
+
 class TextureCompareFuncValidator {
  public:
   bool IsValid(const GLenum value) const;