Move shader precision modifier check onto GLSLCaps

src/gpu/gl/builders/GrGLShaderBuilder.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLShaderBuilder_DEFINED
 #define GrGLShaderBuilder_DEFINED
 
 #include "SkTArray.h"
 #include "gl/GrGLFragmentProcessor.h"
 #include "gl/GrGLProgramDesc.h"
 #include "gl/GrGLProgramDataManager.h"
+#include "gl/GrGLTypes.h"
 
 #include <stdarg.h>
 
+class GrGLCaps;
 class GrGLContextInfo;
 class GrGLProgramBuilder;
 
 /**
   base class for all shaders builders
 */
 class GrGLShaderBuilder {
 public:
     typedef GrGLProcessor::TransformedCoordsArray TransformedCoordsArray;
     typedef GrGLProcessor::TextureSampler TextureSampler;
@@ skipping 171 matching lines @@
     VarArray fOutputs;
     uint32_t fFeaturesAddedMask;
     SkSTArray<1, SkString> fLayoutParams[kLastInterfaceQualifier + 1];
     int fCodeIndex;
     bool fFinalized;
 
     friend class GrGLProgramBuilder;
     friend class GrGLPathProgramBuilder; // to access fInputs.
 };
 #endif