Remove kDisableBlend_BlendOptFlag as it is no longer needed

src/gpu/GrDrawState.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawState_DEFINED
 #define GrDrawState_DEFINED
 
@@ skipping 503 matching lines @@
     enum BlendOptFlags {
         /**
          * No optimization
          */
         kNone_BlendOpt                  = 0,
         /**
          * Don't draw at all
          */
         kSkipDraw_BlendOptFlag          = 0x1,
         /**
-         * Emit the src color, disable HW blending (replace dst with src)
-         */
-        kDisableBlend_BlendOptFlag      = 0x2,
-        /**
          * The coverage value does not have to be computed separately from alpha, the the output
          * color can be the modulation of the two.
          */
-        kCoverageAsAlpha_BlendOptFlag   = 0x4,
+        kCoverageAsAlpha_BlendOptFlag   = 0x2,
         /**
          * Instead of emitting a src color, emit coverage in the alpha channel and r,g,b are
          * "don't cares".
          */
-        kEmitCoverage_BlendOptFlag      = 0x8,
+        kEmitCoverage_BlendOptFlag      = 0x4,
         /**
          * Emit transparent black instead of the src color, no need to compute coverage.
          */
-        kEmitTransBlack_BlendOptFlag    = 0x10,
+        kEmitTransBlack_BlendOptFlag    = 0x8,
         /**
          * Flag used to invalidate the cached BlendOptFlags, OptSrcCoeff, and OptDstCoeff cached by
          * the get BlendOpts function. 
          */
-        kInvalid_BlendOptFlag        = 0x20,
+        kInvalid_BlendOptFlag        = 0x10,
     };

[bsalomon, 2014/07/30 19:49:30]

Why not just make this 1 << 31 so that we never update it again?

[egdaniel, 2014/07/30 20:06:38]

Done but hopefully, fingers crossed, these flags will go away soon.

     GR_DECL_BITFIELD_OPS_FRIENDS(BlendOptFlags);
 
     void invalidateBlendOptFlags() {
         fBlendOptFlags = kInvalid_BlendOptFlag;
     }
 
     /**
      * We don't use suplied vertex color attributes if our blend mode is EmitCoverage or
      * EmitTransBlack
      */
@@ skipping 452 matching lines @@
      *  @param count      the number of attributes being set, limited to kMaxVertexAttribCnt.
      */
     void setVertexAttribs(const GrVertexAttrib attribs[], int count);
 
     typedef SkRefCnt INHERITED;
 };
 
 GR_MAKE_BITFIELD_OPS(GrDrawState::BlendOptFlags);
 
 #endif