Move SkGLContext and some GrGLInterface implementations to skgputest module

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1815823002
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Committed: https://skia.googlesource.com/skia/+/fe3456cb006110d045b26ff3f8681b893a757b58

Review URL: https://codereview.chromium.org/1815823002
diff --git a/tools/skiaserve/Request.cpp b/tools/skiaserve/Request.cpp
index 1d946ab..d9e1bda 100644
--- a/tools/skiaserve/Request.cpp
+++ b/tools/skiaserve/Request.cpp
@@ -10,6 +10,8 @@
 #include "SkPictureRecorder.h"
 #include "SkPixelSerializer.h"
 
+using namespace sk_gpu_test;
+
 static int kDefaultWidth = 1920;
 static int kDefaultHeight = 1080;
 
@@ -63,8 +65,8 @@
 SkCanvas* Request::getCanvas() {
 #if SK_SUPPORT_GPU
     GrContextFactory* factory = fContextFactory;
-    SkGLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
-                                              GrContextFactory::kNone_GLContextOptions).fGLContext;
+    GLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType,
+                                            GrContextFactory::kNone_GLContextOptions).fGLContext;
     gl->makeCurrent();
 #endif
     SkASSERT(fDebugCanvas);