Implement support for CHROMIUM_path_rendering pseudo extension

src/gpu/gl/GrGLPathRendering.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLPathRendering_DEFINED
 #define GrGLPathRendering_DEFINED
 
@@ skipping 28 matching lines @@
 
     /* Called when the 3D context state is unknown. */
     void resetContext();
 
     /**
      * Called when the GPU resources have been lost and need to be abandoned
      * (for example after a context loss).
      */
     void abandonGpuResources();
 
+    bool shouldBindFragmentInputs() const {
+        return fCaps.bindFragmentInputSupport;
+    }
+
     // Functions for "separable shader" texturing support.
     void setProgramPathFragmentInputTransform(GrGLuint program, GrGLint location,
                                               GrGLenum genMode, GrGLint components,
                                               const SkMatrix&);
 
     /* Sets the projection matrix for path rendering */
     void setProjectionMatrix(const SkMatrix& matrix,
                              const SkISize& renderTargetSize,
                              GrSurfaceOrigin renderTargetOrigin);
 
     GrGLuint genPaths(GrGLsizei range);
     GrGLvoid deletePaths(GrGLuint path, GrGLsizei range);
 
 protected:
     void onStencilPath(const StencilPathArgs&, const GrPath*) override;
     void onDrawPath(const DrawPathArgs&, const GrPath*) override;
     void onDrawPaths(const DrawPathArgs&, const GrPathRange*, const void* indices, PathIndexType,
                      const float transformValues[], PathTransformType, int count) override;
 private:
+    /**
+     * Mark certain functionality as not supported.
+     */
+    struct Caps {
+        bool bindFragmentInputSupport : 1;
+    };
+
     void flushPathStencilSettings(const GrStencilSettings&);
 
     struct MatrixState {
         SkMatrix        fViewMatrix;
         SkISize         fRenderTargetSize;
         GrSurfaceOrigin fRenderTargetOrigin;
 
         MatrixState() { this->invalidate(); }
         void invalidate() {
             fViewMatrix = SkMatrix::InvalidMatrix();
@@ skipping 18 matching lines @@
             }
             combined.preConcat(fViewMatrix);
             GrGLGetMatrix<Size>(destMatrix, combined);
         }
     };
     GrGLGpu* gpu();
 
     SkAutoTDelete<GrGLNameAllocator> fPathNameAllocator;
     MatrixState fHWProjectionMatrixState;
     GrStencilSettings fHWPathStencilSettings;
+    Caps fCaps;
 };
 
 #endif