fixup precision with configurable atlas

src/gpu/gl/builders/GrGLProgramBuilder.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 GrGLProgramBuilder_DEFINED
 #define GrGLProgramBuilder_DEFINED
 
 #include "GrGLFragmentShaderBuilder.h"
 #include "GrGLGeometryShaderBuilder.h"
 #include "GrGLVertexShaderBuilder.h"
 #include "../GrGLProgramDataManager.h"
 #include "../GrGLPathProgramDataManager.h"
 #include "../GrGLUniformHandle.h"
 #include "../GrGLPrimitiveProcessor.h"
 #include "../GrGLXferProcessor.h"
 #include "../../GrPendingFragmentStage.h"
 #include "../../GrPipeline.h"
 
+// Enough precision to represent 1 / 2048 accurately in printf
+#define GR_SIGNIFICANT_POW2_DECIMAL_DIG 11
+
 /*
  * This is the base class for a series of interfaces.  This base class *MUST* remain abstract with
  * NO data members because it is used in multiple interface inheritance.
  * Heirarchy:
  *                      GrGLUniformBuilder
  *                     /                  \
  *                GrGLFPBuilder       GrGLGPBuilder
  *                     \                  /
  *                     GrGLProgramBuilder(internal use only)
  */
@@ skipping 365 matching lines @@
     GrGLPrimitiveProcessor::TransformsIn fCoordTransforms;
     GrGLPrimitiveProcessor::TransformsOut fOutCoords;
     SkTArray<UniformHandle> fSamplerUniforms;
 
     friend class GrGLShaderBuilder;
     friend class GrGLVertexBuilder;
     friend class GrGLFragmentShaderBuilder;
     friend class GrGLGeometryBuilder;
 };
 #endif