Move GLSL-specific routines/classes to separate glsl directory

src/gpu/glsl/GrGLSL.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 GrGLSL_DEFINED
 #define GrGLSL_DEFINED
 
-#include "gl/GrGLInterface.h"
-#include "GrColor.h"
 #include "GrTypesPriv.h"
 #include "SkString.h"
 
-class GrGLContextInfo;
-class GrGLShaderVar;
-
 // Limited set of GLSL versions we build shaders for. Caller should round
 // down the GLSL version to one of these enums.
 enum GrGLSLGeneration {
     /**
      * Desktop GLSL 1.10 and ES2 shading language (based on desktop GLSL 1.20)
      */
     k110_GrGLSLGeneration,
     /**
      * Desktop GLSL 1.30
      */
     k130_GrGLSLGeneration,
     /**
      * Desktop GLSL 1.40
      */
     k140_GrGLSLGeneration,
     /**
      * Desktop GLSL 1.50
      */
     k150_GrGLSLGeneration,
     /**
      * Desktop GLSL 3.30, and ES GLSL 3.00
      */
     k330_GrGLSLGeneration,
     /**
      * ES GLSL 3.10 only TODO Make GLSLCap objects to make this more granular
      */
     k310es_GrGLSLGeneration,
 };
 
-/**
- * Gets the most recent GLSL Generation compatible with the OpenGL context.
- */
-bool GrGetGLSLGeneration(const GrGLInterface* gl, GrGLSLGeneration* generation);
-
 bool GrGLSLSupportsNamedFragmentShaderOutputs(GrGLSLGeneration);
 
 /**
- * Returns a string to include at the beginning of a shader to declare the GLSL
- * version.
- */
-const char* GrGetGLSLVersionDecl(const GrGLContextInfo&);
-
-/**
- * Adds a line of GLSL code to declare the default precision for float types.
- */
-void GrGLSLAppendDefaultFloatPrecisionDeclaration(GrSLPrecision, GrGLStandard, SkString* out);
-
-/**
  * Gets the name of the function that should be used to sample a 2D texture. Coord type is used
  * to indicate whether the texture is sampled using projective textured (kVec3f) or not (kVec2f).
  */
 inline const char* GrGLSLTexture2DFunctionName(GrSLType coordType, GrGLSLGeneration glslGen) {
     if (kVec2f_GrSLType == coordType) {
         return glslGen >= k130_GrGLSLGeneration ? "texture" : "texture2D";
     } else {
         SkASSERT(kVec3f_GrSLType == coordType);
         return glslGen >= k130_GrGLSLGeneration ? "textureProj" : "texture2DProj";
     }
@@ skipping 261 matching lines @@
 
 /**
  * Does an inplace mul, *=, of vec4VarName by mulFactor.
  * A semicolon is added after the assignment.
  */
 void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor);
 
 #include "GrGLSL_impl.h"
 
 #endif