Disable advance blend equations.

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 1781f3db49b0798d055d1b8aeb10787d42ff9b1e..06ebe3d34d0890468870cd1245f643a9220df16c 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -269,6 +269,8 @@ bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
         fStencilWrapOpsSupport = true;
     }
 
+// Disabling advanced blend until we can resolve various bugs
+#if 0
     if (kIntel_GrGLVendor != ctxInfo.vendor()) {
         if (ctxInfo.hasExtension("GL_KHR_blend_equation_advanced_coherent") ||
             ctxInfo.hasExtension("GL_NV_blend_equation_advanced_coherent")) {
@@ -283,7 +285,7 @@ bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
         // On Intel platforms, KHR_blend_equation_advanced is not conformant.
         fBlendEquationSupport = kBasic_BlendEquationSupport;
     }
-
+#endif
     if (kGL_GrGLStandard == standard) {
         fMapBufferFlags = kCanMap_MapFlag; // we require VBO support and the desktop VBO
                                             // extension includes glMapBuffer.