Move shader precision modifier check onto GLSLCaps

src/gpu/gl/builders/GrGLProgramBuilder.h

Index: src/gpu/gl/builders/GrGLProgramBuilder.h
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.h b/src/gpu/gl/builders/GrGLProgramBuilder.h
index fcf7007f72fc1330a40ecb0239a99aaa4d7b7d77..96ede237f3998d98903d2f15263384ef77780c80 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.h
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.h
@@ -17,6 +17,7 @@
 #include "../../GrPipeline.h"
 
 class GrFragmentProcessor;
+class GrGLSLCaps;
 
 // Enough precision to represent 1 / 2048 accurately in printf
 #define GR_SIGNIFICANT_POW2_DECIMAL_DIG 11
@@ -75,6 +76,8 @@ public:
 
     virtual const GrGLContextInfo& ctxInfo() const = 0;
 
+    virtual const GrGLSLCaps* glslCaps() const = 0;
+
     virtual GrGLGpu* gpu() const = 0;
 
     /*
@@ -250,6 +253,8 @@ public:
 
     const GrGLContextInfo& ctxInfo() const override;
 
+    const GrGLSLCaps* glslCaps() const override;
+
     GrGLGpu* gpu() const override { return fGpu; }
 
     GrGLXPFragmentBuilder* getFragmentShaderBuilder() override { return &fFS; }