Turn ContextInfos returned by GrContextFactory into structs.

tests/SRGBReadWritePixelsTest.cpp

Index: tests/SRGBReadWritePixelsTest.cpp
diff --git a/tests/SRGBReadWritePixelsTest.cpp b/tests/SRGBReadWritePixelsTest.cpp
index a652e94bfcf31f4a21ac14fe647283e0e4db10a7..fdaa587de73cf0ee7e686f1d7085a2e3f43af131 100644
--- a/tests/SRGBReadWritePixelsTest.cpp
+++ b/tests/SRGBReadWritePixelsTest.cpp
@@ -139,7 +139,7 @@ void read_and_check_pixels(skiatest::Reporter* reporter, GrTexture* texture, uin
 // TODO: Add tests for copySurface between srgb/linear textures. Add tests for unpremul/premul
 // conversion during read/write along with srgb/linear conversions.
 DEF_GPUTEST_FOR_GL_RENDERING_CONTEXTS(SRGBReadWritePixels, reporter, ctxInfo) {
-    GrContext* context = ctxInfo.fGrContext;
+    GrContext* context = ctxInfo.grContext();
 #if defined(GOOGLE3)
     // Stack frame size is limited in GOOGLE3.
     static const int kW = 63;