Fixed some warnings.

command_buffer/service/cross/gl/sampler_gl.cc

 /*
  * Copyright 2009, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 139 matching lines @@
 void SamplerGL::SetStates(sampler::AddressingMode addressing_u,
                           sampler::AddressingMode addressing_v,
                           sampler::AddressingMode addressing_w,
                           sampler::FilteringMode mag_filter,
                           sampler::FilteringMode min_filter,
                           sampler::FilteringMode mip_filter,
                           unsigned int max_anisotropy) {
   // These are validated in GAPIDecoder.cc
   DCHECK_NE(mag_filter, sampler::NONE);
   DCHECK_NE(min_filter, sampler::NONE);
-  DCHECK_GT(max_anisotropy, 0);
+  DCHECK_GT(max_anisotropy, 0U);
   gl_wrap_s_ = GLAddressMode(addressing_u);
   gl_wrap_t_ = GLAddressMode(addressing_v);
   gl_wrap_r_ = GLAddressMode(addressing_w);
   gl_mag_filter_ = GLMagFilter(mag_filter);
   gl_min_filter_ = GLMinFilter(min_filter, mip_filter);
   gl_max_anisotropy_ = max_anisotropy;
 }
 
 void SamplerGL::SetBorderColor(const RGBA &color) {
   gl_border_color_[0] = color.red;
@@ skipping 58 matching lines @@
     return BufferSyncInterface::kParseInvalidArguments;
   // Dirty effect, because this sampler id may be used.
   DirtyEffect();
   sampler->SetTexture(texture_id);
   return BufferSyncInterface::kParseNoError;
 }
 
 
 }  // namespace command_buffer
 }  // namespace o3d