Make the Sk GL context class an abstract base class

src/gpu/gl/iOS/SkNativeGLContext_iOS.mm

Index: src/gpu/gl/iOS/SkNativeGLContext_iOS.mm
diff --git a/src/gpu/gl/iOS/SkNativeGLContext_iOS.mm b/src/gpu/gl/iOS/SkNativeGLContext_iOS.mm
deleted file mode 100644
index 1bdaf70f1c37c60fb47caecda58ece76a8acbb04..0000000000000000000000000000000000000000
--- a/src/gpu/gl/iOS/SkNativeGLContext_iOS.mm
+++ /dev/null
@@ -1,71 +0,0 @@
-
-/*
- * 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/SkNativeGLContext.h"
-#import <OpenGLES/EAGL.h>
-
-#define EAGLCTX ((EAGLContext*)(fEAGLContext))
-
-SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
-    fEAGLContext = [EAGLContext currentContext];
-    if (EAGLCTX) {
-        [EAGLCTX retain];
-    }
-}
-
-SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
-    if (EAGLCTX) {
-        [EAGLContext setCurrentContext:EAGLCTX];
-        [EAGLCTX release];
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-SkNativeGLContext::SkNativeGLContext()
-    : fEAGLContext(NULL) {
-}
-
-SkNativeGLContext::~SkNativeGLContext() {
-    this->destroyGLContext();
-}
-
-void SkNativeGLContext::destroyGLContext() {
-    if (fEAGLContext) {
-        if ([EAGLContext currentContext] == EAGLCTX) {
-            [EAGLContext setCurrentContext:nil];
-        }
-        [EAGLCTX release];
-        fEAGLContext = NULL;
-    }
-}
-
-const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
-    if (kGL_GrGLStandard == forcedGpuAPI) {
-        return NULL;
-    }
-
-    fEAGLContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
-    [EAGLContext setCurrentContext:EAGLCTX];
-    
-    const GrGLInterface* interface = GrGLCreateNativeInterface();
-    if (!interface) {
-        SkDebugf("Failed to create gl interface");
-        this->destroyGLContext();
-        return NULL;
-    }
-    return interface;
-}
-
-void SkNativeGLContext::makeCurrent() const {
-    if (![EAGLContext setCurrentContext:EAGLCTX]) {
-        SkDebugf("Could not set the context.\n");
-    }
-}
-
-void SkNativeGLContext::swapBuffers() const { }