Revert of Attach GrOptDrawState into shader building pipeline

src/gpu/GrRODrawState.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrRODrawState.h"
 
 #include "GrDrawTargetCaps.h"
@@ skipping 166 matching lines @@
                                                          GrBlendCoeff* srcCoeff,
                                                          GrBlendCoeff* dstCoeff) const {
     GrBlendCoeff bogusSrcCoeff, bogusDstCoeff;
     if (NULL == srcCoeff) {
         srcCoeff = &bogusSrcCoeff;
     }
     if (NULL == dstCoeff) {
         dstCoeff = &bogusDstCoeff;
     }
 
+    if (forceCoverage) {
+        return this->calcBlendOpts(true, srcCoeff, dstCoeff);
+    }
+
+    if (0 == (fBlendOptFlags & kInvalid_BlendOptFlag)) {
+        *srcCoeff = fOptSrcBlend;
+        *dstCoeff = fOptDstBlend;
+        return fBlendOptFlags;
+    }
+
+    fBlendOptFlags = this->calcBlendOpts(forceCoverage, srcCoeff, dstCoeff);
+    fOptSrcBlend = *srcCoeff;
+    fOptDstBlend = *dstCoeff;
+
+    return fBlendOptFlags;
+}
+
+GrRODrawState::BlendOptFlags GrRODrawState::calcBlendOpts(bool forceCoverage,
+                                                          GrBlendCoeff* srcCoeff,
+                                                          GrBlendCoeff* dstCoeff) const {
     *srcCoeff = this->getSrcBlendCoeff();
     *dstCoeff = this->getDstBlendCoeff();
 
     if (this->isColorWriteDisabled()) {
         *srcCoeff = kZero_GrBlendCoeff;
         *dstCoeff = kOne_GrBlendCoeff;
     }
 
     bool srcAIsOne = this->srcAlphaWillBeOne();
     bool dstCoeffIsOne = kOne_GrBlendCoeff == *dstCoeff ||
@@ skipping 148 matching lines @@
         // Since the shader will multiply coverage and color, the only way the final A==1 is if
         // coverage and color both have A==1.
         return (kA_GrColorComponentFlag & validComponentFlags & coverageComponentFlags) &&
                 0xFF == GrColorUnpackA(color) && 0xFF == GrColorUnpackA(coverage);
 
     }
 
     return (kA_GrColorComponentFlag & validComponentFlags) && 0xFF == GrColorUnpackA(color);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+
+bool GrRODrawState::canIgnoreColorAttribute() const {
+    if (fBlendOptFlags & kInvalid_BlendOptFlag) {
+        this->getBlendOpts();
+    }
+    return SkToBool(fBlendOptFlags & (GrRODrawState::kEmitTransBlack_BlendOptFlag |
+                                      GrRODrawState::kEmitCoverage_BlendOptFlag));
+}
+