Revert of Make the Sk GL context class an abstract base class

tools/PictureRenderer.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "PictureRenderer.h"
 #include "picture_utils.h"
 #include "SamplePipeControllers.h"
@@ skipping 210 matching lines @@
                                                    fPicture->cullRect().height(),
                                                    factory.get(),
                                                    this->recordFlags());
         fPicture->playback(canvas);
         fPicture.reset(recorder.endRecording());
     }
 }
 
 void PictureRenderer::resetState(bool callFinish) {
 #if SK_SUPPORT_GPU
-    SkGLContext* glContext = this->getGLContext();
+    SkGLContextHelper* glContext = this->getGLContext();
     if (NULL == glContext) {
         SkASSERT(kBitmap_DeviceType == fDeviceType);
         return;
     }
 
     fGrContext->flush();
     glContext->swapBuffers();
     if (callFinish) {
         SK_GL(*glContext, Finish());
     }
 #endif
 }
 
 void PictureRenderer::purgeTextures() {
     SkDiscardableMemoryPool* pool = SkGetGlobalDiscardableMemoryPool();
 
     pool->dumpPool();
 
 #if SK_SUPPORT_GPU
-    SkGLContext* glContext = this->getGLContext();
+    SkGLContextHelper* glContext = this->getGLContext();
     if (NULL == glContext) {
         SkASSERT(kBitmap_DeviceType == fDeviceType);
         return;
     }
 
     // resetState should've already done this
     fGrContext->flush();
 
     fGrContext->purgeAllUnlockedResources();
 #endif
@@ skipping 519 matching lines @@
 PictureRenderer* CreateGatherPixelRefsRenderer(const GrContext::Options& opts) {
     return SkNEW_ARGS(GatherRenderer, (opts));
 }
 #else
 PictureRenderer* CreateGatherPixelRefsRenderer() {
     return SkNEW(GatherRenderer);
 }
 #endif
 
 } // namespace sk_tools