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

src/gpu/gl/angle/SkANGLEGLContext.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 "gl/SkANGLEGLContext.h"
 
+SkANGLEGLContext::AutoContextRestore::AutoContextRestore() {
+    fOldEGLContext = eglGetCurrentContext();
+    fOldDisplay = eglGetCurrentDisplay();
+    fOldSurface = eglGetCurrentSurface(EGL_DRAW);
+
+}
+
+SkANGLEGLContext::AutoContextRestore::~AutoContextRestore() {
+    if (fOldDisplay) {
+        eglMakeCurrent(fOldDisplay, fOldSurface, fOldSurface, fOldEGLContext);
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 SkANGLEGLContext::SkANGLEGLContext()
     : fContext(EGL_NO_CONTEXT)
     , fDisplay(EGL_NO_DISPLAY)
     , fSurface(EGL_NO_SURFACE) {
 }
 
 SkANGLEGLContext::~SkANGLEGLContext() {
     this->destroyGLContext();
 }
 
@@ skipping 71 matching lines @@
     if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
         SkDebugf("Could not set the context.\n");
     }
 }
 
 void SkANGLEGLContext::swapBuffers() const {
     if (!eglSwapBuffers(fDisplay, fSurface)) {
         SkDebugf("Could not complete eglSwapBuffers.\n");
     }
 }