Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

dm/DMSrcSink.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef DMSrcSink_DEFINED
 #define DMSrcSink_DEFINED
 
@@ skipping 214 matching lines @@
     NullSink() {}
 
     Error draw(const Src& src, SkBitmap*, SkWStream*, SkString*) const override;
     const char* fileExtension() const override { return ""; }
     SinkFlags flags() const override { return SinkFlags{ SinkFlags::kNull, SinkFlags::kDirect }; }
 };
 
 
 class GPUSink : public Sink {
 public:
-    GPUSink(sk_gpu_test::GrContextFactory::GLContextType,
-            sk_gpu_test::GrContextFactory::GLContextOptions,
+    GPUSink(GrContextFactory::GLContextType, GrContextFactory::GLContextOptions,
             int samples, bool diText, SkColorType colorType, SkColorProfileType profileType,
             bool threaded);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     bool serial() const override { return !fThreaded; }
     const char* fileExtension() const override { return "png"; }
     SinkFlags flags() const override { return SinkFlags{ SinkFlags::kGPU, SinkFlags::kDirect }; }
 private:
-    sk_gpu_test::GrContextFactory::GLContextType    fContextType;
-    sk_gpu_test::GrContextFactory::GLContextOptions fContextOptions;
-    int                                             fSampleCount;
-    bool                                            fUseDIText;
-    SkColorType                                     fColorType;
-    SkColorProfileType                              fProfileType;
-    bool                                            fThreaded;
+    GrContextFactory::GLContextType    fContextType;
+    GrContextFactory::GLContextOptions fContextOptions;
+    int                                fSampleCount;
+    bool                               fUseDIText;
+    SkColorType                        fColorType;
+    SkColorProfileType                 fProfileType;
+    bool                               fThreaded;
 };
 
 class PDFSink : public Sink {
 public:
     PDFSink(const char* rasterizer);
 
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
     const char* fileExtension() const override { return "pdf"; }
     SinkFlags flags() const override { return SinkFlags{ SinkFlags::kVector, SinkFlags::kDirect }; }
 private:
@@ skipping 113 matching lines @@
 
 class ViaMojo : public Via {
 public:
     explicit ViaMojo(Sink* sink) : Via(sink) {}
     Error draw(const Src&, SkBitmap*, SkWStream*, SkString*) const override;
 };
 
 }  // namespace DM
 
 #endif//DMSrcSink_DEFINED