Turned on SkSL->GLSL compiler

src/gpu/gl/GrGLContext.h

Index: src/gpu/gl/GrGLContext.h
diff --git a/src/gpu/gl/GrGLContext.h b/src/gpu/gl/GrGLContext.h
index 6016f6859a35e5cbfd9213dd043d6b85813e7f2d..8207ac89b0092d0b7ed3d392bf31f3ef29f73f33 100644
--- a/src/gpu/gl/GrGLContext.h
+++ b/src/gpu/gl/GrGLContext.h
@@ -15,6 +15,9 @@
 #include "GrGLUtil.h"
 
 struct GrContextOptions;
+namespace SkSL {
+    class Compiler;
+}
 
 /**
  * Encapsulates information about an OpenGL context including the OpenGL
@@ -39,6 +42,8 @@ public:
 
     const GrGLExtensions& extensions() const { return fInterface->fExtensions; }
 
+    virtual ~GrGLContextInfo() {}
+
 protected:
     struct ConstructorArgs {
         const GrGLInterface*                fInterface;
@@ -64,7 +69,7 @@ protected:
 };
 
 /**
- * Extension of GrGLContextInfo that also provides access to GrGLInterface.
+ * Extension of GrGLContextInfo that also provides access to GrGLInterface and SkSL::Compiler.
  */
 class GrGLContext : public GrGLContextInfo {
 public:
@@ -76,8 +81,16 @@ public:
 
     const GrGLInterface* interface() const { return fInterface; }
 
+    SkSL::Compiler* compiler() const;
+
+    ~GrGLContext() override;
+
 private:
-    GrGLContext(const ConstructorArgs& args) : INHERITED(args) {}
+    GrGLContext(const ConstructorArgs& args) 
+    : INHERITED(args)
+    , fCompiler(nullptr) {}
+
+    mutable SkSL::Compiler* fCompiler;
 
     typedef GrGLContextInfo INHERITED;
 };