Revert of SkRTConf: reduce functionality to what we use, increase simplicity

src/gpu/gl/builders/GrGLShaderStringBuilder.cpp

Index: src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp b/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
index 296c2beb44fa35ee7cc08d2076fa9b766bfa9b11..b4ce2824e2eda76034ea8268626b32720ca0e126 100644
--- a/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
@@ -8,13 +8,14 @@
 #include "GrGLShaderStringBuilder.h"
 #include "gl/GrGLGpu.h"
 #include "gl/GrGLSLPrettyPrint.h"
+#include "SkRTConf.h"
 #include "SkTraceEvent.h"
 
 #define GL_CALL(X) GR_GL_CALL(gpu->glInterface(), X)
 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(gpu->glInterface(), R, X)
 
-// Print the source code for all shaders generated.
-static const bool c_PrintShaders{false};
+SK_CONF_DECLARE(bool, c_PrintShaders, "gpu.printShaders", false,
+                "Print the source code for all shaders generated.");
 
 static void print_shader_source(const char** strings, int* lengths, int count);