Revert of Remove gpu shader optimatization for solid white or trans black colors

src/gpu/gl/GrGLShaderBuilder.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gl/GrGLShaderBuilder.h"
 #include "gl/GrGLProgram.h"
 #include "gl/GrGLUniformHandle.h"
@@ skipping 146 matching lines @@
 
     GrGLSLExpr4 inputColor;
     GrGLSLExpr4 inputCoverage;
 
     if (GrGLProgramDesc::kUniform_ColorInput == header.fColorInput) {
         const char* name;
         fOutput.fUniformHandles.fColorUni =
             this->addUniform(GrGLShaderBuilder::kFragment_Visibility, kVec4f_GrSLType, "Color",
                              &name);
         inputColor = GrGLSLExpr4(name);
+    } else if (GrGLProgramDesc::kSolidWhite_ColorInput == header.fColorInput) {
+        inputColor = GrGLSLExpr4(1);
+    } else if (GrGLProgramDesc::kTransBlack_ColorInput == header.fColorInput) {
+        inputColor = GrGLSLExpr4(0);
     }
 
     if (GrGLProgramDesc::kUniform_ColorInput == header.fCoverageInput) {
         const char* name;
         fOutput.fUniformHandles.fCoverageUni =
             this->addUniform(GrGLShaderBuilder::kFragment_Visibility, kVec4f_GrSLType, "Coverage",
                              &name);
         inputCoverage = GrGLSLExpr4(name);
     } else if (GrGLProgramDesc::kSolidWhite_ColorInput == header.fCoverageInput) {
         inputCoverage = GrGLSLExpr4(1);
+    } else if (GrGLProgramDesc::kTransBlack_ColorInput == header.fCoverageInput) {
+        inputCoverage = GrGLSLExpr4(0);
     }
 
     if (k110_GrGLSLGeneration != fGpu->glslGeneration()) {
         fFSOutputs.push_back().set(kVec4f_GrSLType,
                                    GrGLShaderVar::kOut_TypeModifier,
                                    declared_color_output_name());
         fHasCustomColorOutput = true;
     }
 
     this->emitCodeBeforeEffects(&inputColor, &inputCoverage);
@@ skipping 906 matching lines @@
 
     GrGLPathTexGenProgramEffectsBuilder pathTexGenEffectsBuilder(this,
                                                                  effectCnt);
     this->INHERITED::createAndEmitEffects(&pathTexGenEffectsBuilder,
                                           effectStages,
                                           effectKeys,
                                           effectCnt,
                                           inOutFSColor);
     return pathTexGenEffectsBuilder.finish();
 }