Add new surface flag

include/gpu/GrTypes.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTypes_DEFINED
 #define GrTypes_DEFINED
 
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  * Optional bitfield flags that can be set on GrSurfaceDesc (below).
  */
 enum GrSurfaceFlags {
     kNone_GrSurfaceFlags            = 0x0,
     /**
      * Creates a texture that can be rendered to as a GrRenderTarget. Use
      * GrTexture::asRenderTarget() to access.
      */
     kRenderTarget_GrSurfaceFlag     = 0x1,
     /**
+     * Placeholder for managing zero-copy textures
+     */
+    kZeroCopy_GrSurfaceFlag         = 0x2,
+    /**
      * Indicates that all allocations (color buffer, FBO completeness, etc)
      * should be verified.
      */
     kCheckAllocation_GrSurfaceFlag  = 0x4,
 };
 
 GR_MAKE_BITFIELD_OPS(GrSurfaceFlags)
 
 /**
  * Some textures will be stored such that the upper and left edges of the content meet at the
@@ skipping 204 matching lines @@
             return 4 * width * height;
     }
 }
 
 /**
  * This value translates to reseting all the context state for any backend.
  */
 static const uint32_t kAll_GrBackendState = 0xffffffff;
 
 #endif