Revert of Cleanup legacy NVPR-related definitions

src/gpu/gl/GrGLPathRendering.h

Index: src/gpu/gl/GrGLPathRendering.h
diff --git a/src/gpu/gl/GrGLPathRendering.h b/src/gpu/gl/GrGLPathRendering.h
index 86cf1b1698ac8aed0e6f3d18d119ffb8a6588ce6..20fd4967b7de0469595b4c2f37c36ba35db48e74 100644
--- a/src/gpu/gl/GrGLPathRendering.h
+++ b/src/gpu/gl/GrGLPathRendering.h
@@ -65,7 +65,34 @@
     void onDrawPaths(const DrawPathArgs&, const GrPathRange*, const void* indices, PathIndexType,
                      const float transformValues[], PathTransformType, int count) override;
 private:
+    /**
+     * Mark certain functionality as not supported if the driver version is too
+     * old and a backup implementation is not practical.
+     */
+    struct Caps {
+        bool stencilThenCoverSupport : 1;
+        bool fragmentInputGenSupport : 1;
+    };
+    const Caps& caps() const { return fCaps; }
+
     void flushPathStencilSettings(const GrStencilSettings&);
+
+    // NV_path_rendering v1.2
+    void stencilThenCoverFillPath(GrGLuint path, GrGLenum fillMode,
+                                  GrGLuint mask, GrGLenum coverMode);
+
+    void stencilThenCoverStrokePath(GrGLuint path, GrGLint reference,
+                                    GrGLuint mask, GrGLenum coverMode);
+
+    void stencilThenCoverFillPathInstanced(
+        GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths,
+                         GrGLuint pathBase, GrGLenum fillMode, GrGLuint mask, GrGLenum coverMode,
+                         GrGLenum transformType, const GrGLfloat *transformValues);
+
+    void stencilThenCoverStrokePathInstanced(
+                         GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths,
+                         GrGLuint pathBase, GrGLint reference, GrGLuint mask, GrGLenum coverMode,
+                         GrGLenum transformType, const GrGLfloat *transformValues);
 
     struct MatrixState {
         SkMatrix        fViewMatrix;
@@ -101,8 +128,14 @@
     GrGLGpu* gpu();
 
     SkAutoTDelete<GrGLNameAllocator> fPathNameAllocator;
+    Caps fCaps;
     MatrixState fHWProjectionMatrixState;
     GrStencilSettings fHWPathStencilSettings;
+    struct PathTexGenData {
+        GrGLenum  fMode;
+        GrGLint   fNumComponents;
+        GrGLfloat fCoefficients[3 * 3];
+    };
 };
 
 #endif