added support for glMinSampleShading

src/gpu/gl/GrGLGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 322 matching lines @@
     void didWriteToSurface(GrSurface*, const SkIRect* bounds) const;
 
     // Need not be called if flushRenderTarget is used.
     void flushViewport(const GrGLIRect&);
 
     void flushStencil(const GrStencilSettings&);
 
     // rt is used only if useHWAA is true.
     void flushHWAAState(GrRenderTarget* rt, bool useHWAA, bool stencilEnabled);
 
+    void flushMinSampleShading(float minSampleShading);
+
     // helper for onCreateTexture and writeTexturePixels
     enum UploadType {
         kNewTexture_UploadType,    // we are creating a new texture
         kWrite_UploadType,         // we are using TexSubImage2D to copy data to an existing texture
         kTransfer_UploadType,      // we are using a transfer buffer to copy data
     };
     bool uploadTexData(const GrSurfaceDesc& desc,
                        GrGLenum target,
                        UploadType uploadType,
                        int left, int top, int width, int height,
@@ skipping 259 matching lines @@
 
     struct {
         GrGLuint    fProgram;
         GrGLint     fPosXformUniform;
         GrGLuint    fArrayBuffer;
     } fPLSSetupProgram;
 
     bool fHWPLSEnabled;
     bool fPLSHasBeenUsed;
 
+    float fHWMinSampleShading;
+
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif