Create swizzle table inside of glsl caps

src/gpu/GrCaps.cpp

Index: src/gpu/GrCaps.cpp
diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index 4095f1ab10e016404d02d894513b2113b97535ed..e2d3b0c300ea2d409d3821809947c929e1e55287 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -77,6 +77,7 @@ SkString GrShaderCaps::dump() const {
 
 void GrShaderCaps::applyOptionsOverrides(const GrContextOptions& options) {
     fDualSourceBlendingSupport = fDualSourceBlendingSupport && !options.fSuppressDualSourceBlending;
+    this->onApplyOptionsOverrides(options);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -121,6 +122,7 @@ GrCaps::GrCaps(const GrContextOptions& options) {
 
 void GrCaps::applyOptionsOverrides(const GrContextOptions& options) {
     fMaxTextureSize = SkTMin(fMaxTextureSize, options.fMaxTextureSizeOverride);
+    this->onApplyOptionsOverrides(options);
 }
 
 static SkString map_flags_to_string(uint32_t flags) {