Fixes for re-enabling more MSVC level 4 warnings: gpu/ edition

gpu/command_buffer/service/gles2_cmd_decoder.h

Index: gpu/command_buffer/service/gles2_cmd_decoder.h
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.h b/gpu/command_buffer/service/gles2_cmd_decoder.h
index 41d2938ab0c258e46581b8c0729a4a136671ad4a..025eefab3a0f605696e572174c0defc8418b5b1c 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.h
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.h
@@ -59,6 +59,11 @@ class GPU_EXPORT GLES2Decoder : public base::SupportsWeakPtr<GLES2Decoder>,
   typedef error::Error Error;
   typedef base::Callback<bool(uint32 id)> WaitSyncPointCallback;
 
+  // The default stencil mask, which has all bits set.  This really should be a
+  // GLuint, but we can't #include gl_bindings.h in this file without causing
+  // macro redefinitions.
+  static const unsigned int kDefaultStencilMask;
+
   // Creates a decoder.
   static GLES2Decoder* Create(ContextGroup* group);