Make appending default precision be controled by GLSL

src/gpu/gl/GrGLGLSL.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLGLSL.h"
 #include "GrGLContext.h"
 #include "GrGLUtil.h"
@@ skipping 30 matching lines @@
             } else {
                 *generation = k110_GrGLSLGeneration;
             }
             return true;
         default:
             SkFAIL("Unknown GL Standard");
             return false;
     }
 }
 
-void GrGLAppendGLSLDefaultFloatPrecisionDeclaration(GrSLPrecision p, GrGLStandard s, SkString* out) {
-    // Desktop GLSL has added precision qualifiers but they don't do anything.
-    if (kGLES_GrGLStandard == s) {
-        switch (p) {
-            case kHigh_GrSLPrecision:
-                out->append("precision highp float;\n");
-                break;
-            case kMedium_GrSLPrecision:
-                out->append("precision mediump float;\n");
-                break;
-            case kLow_GrSLPrecision:
-                out->append("precision lowp float;\n");
-                break;
-            default:
-                SkFAIL("Unknown precision value.");
-        }
-    }
-}