Create swizzle table inside of glsl caps

src/gpu/glsl/GrGLSLCaps.cpp

Index: src/gpu/glsl/GrGLSLCaps.cpp
diff --git a/src/gpu/glsl/GrGLSLCaps.cpp b/src/gpu/glsl/GrGLSLCaps.cpp
index 54d041e3a0ebafa5e19594cdbd9da3ba67d287c7..140cb11494753e28e0b3fea639124b2c551be5cc 100755
--- a/src/gpu/glsl/GrGLSLCaps.cpp
+++ b/src/gpu/glsl/GrGLSLCaps.cpp
@@ -8,6 +8,8 @@
 
 #include "GrGLSLCaps.h"
 
+#include "GrContextOptions.h"
+
 ////////////////////////////////////////////////////////////////////////////////////////////
 
 GrGLSLCaps::GrGLSLCaps(const GrContextOptions& options) {
@@ -25,6 +27,9 @@ GrGLSLCaps::GrGLSLCaps(const GrContextOptions& options) {
     fFBFetchColorName = nullptr;
     fFBFetchExtensionString = nullptr;
     fAdvBlendEqInteraction = kNotSupported_AdvBlendEqInteraction;
+
+    fMustSwizzleInShader = false;
+    memset(fConfigSwizzle, 0, sizeof(fConfigSwizzle));
 }
 
 SkString GrGLSLCaps::dump() const {
@@ -56,3 +61,9 @@ SkString GrGLSLCaps::dump() const {
     return r;
 }
 
+void GrGLSLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {
+    if (options.fUseShaderSwizzling) {
+        fMustSwizzleInShader = true;
+    }
+}
+