Implement support for KHR_blend_equation_advanced

src/gpu/gl/GrGLCaps.h

Index: src/gpu/gl/GrGLCaps.h
diff --git a/src/gpu/gl/GrGLCaps.h b/src/gpu/gl/GrGLCaps.h
index 13ba3863b1228efc806a0da20e7c0f0fee30604b..df513591f16b6f8bf349993affbda06b4190f961 100644
--- a/src/gpu/gl/GrGLCaps.h
+++ b/src/gpu/gl/GrGLCaps.h
@@ -399,7 +399,7 @@ public:
      * Initializes the GrGLSLCaps to the set of features supported in the current
      * OpenGL context accessible via ctxInfo.
      */
-    bool init(const GrGLContextInfo& ctxInfo, const GrGLInterface* glInterface);
+    bool init(const GrGLContextInfo&, const GrGLInterface*, const GrGLCaps&);
 
     /**
      * Some helper functions for encapsulating various extensions to read FB Buffer on openglES
@@ -416,6 +416,8 @@ public:
 
     bool dropsTileOnZeroDivide() const { return fDropsTileOnZeroDivide; }
 
+    bool mustEnableAdvancedBlendEquations() const { return fMustEnableAdvancedBlendEquations; }
+
     /**
     * Returns a string containing the caps info.
     */
@@ -428,6 +430,7 @@ private:
     bool fDropsTileOnZeroDivide : 1;
     bool fFBFetchSupport : 1;
     bool fFBFetchNeedsCustomOutput : 1;
+    bool fMustEnableAdvancedBlendEquations : 1;
 
     const char* fFBFetchColorName;
     const char* fFBFetchExtensionString;