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
index 1bdaf70f1c37c60fb47caecda58ece76a8acbb04..1cc51e8a18f570a4575d84df9072f7bda6ebf351 100644
--- a/src/gpu/gl/iOS/SkNativeGLContext_iOS.mm
+++ b/src/gpu/gl/iOS/SkNativeGLContext_iOS.mm
@@ -11,14 +11,32 @@
 
 #define EAGLCTX ((EAGLContext*)(fEAGLContext))
 
-SkNativeGLContext::AutoContextRestore::AutoContextRestore() {
+namespace {
+
+class SkNativeGLContextIOS : public SkNativeGLContext {
+public:
+    SkNativeGLContextIOS();
+
+    virtual ~SkNativeGLContextIOS();
+
+    virtual void makeCurrent() const SK_OVERRIDE;
+    virtual void swapBuffers() const SK_OVERRIDE;
+protected:
+    virtual const GrGLInterface* createGLContext(GrGLStandard forcedGpuAPI) SK_OVERRIDE;
+    virtual void destroyGLContext() SK_OVERRIDE;
+
+private:
+    void* fEAGLContext;
+};
+
+SkNativeGLContextIOS::AutoContextRestore::AutoContextRestore() {
     fEAGLContext = [EAGLContext currentContext];
     if (EAGLCTX) {
         [EAGLCTX retain];
     }
 }
 
-SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
+SkNativeGLContextIOS::AutoContextRestore::~AutoContextRestore() {
     if (EAGLCTX) {
         [EAGLContext setCurrentContext:EAGLCTX];
         [EAGLCTX release];
@@ -27,15 +45,15 @@ SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkNativeGLContext::SkNativeGLContext()
+SkNativeGLContextIOS::SkNativeGLContextIOS()
     : fEAGLContext(NULL) {
 }
 
-SkNativeGLContext::~SkNativeGLContext() {
+SkNativeGLContextIOS::~SkNativeGLContextIOS() {
     this->destroyGLContext();
 }
 
-void SkNativeGLContext::destroyGLContext() {
+void SkNativeGLContextIOS::destroyGLContext() {
     if (fEAGLContext) {
         if ([EAGLContext currentContext] == EAGLCTX) {
             [EAGLContext setCurrentContext:nil];
@@ -45,7 +63,7 @@ void SkNativeGLContext::destroyGLContext() {
     }
 }
 
-const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAPI) {
+const GrGLInterface* SkNativeGLContextIOS::createGLContext(GrGLStandard forcedGpuAPI) {
     if (kGL_GrGLStandard == forcedGpuAPI) {
         return NULL;
     }
@@ -62,10 +80,18 @@ const GrGLInterface* SkNativeGLContext::createGLContext(GrGLStandard forcedGpuAP
     return interface;
 }
 
-void SkNativeGLContext::makeCurrent() const {
+void SkNativeGLContextIOS::makeCurrent() const {
     if (![EAGLContext setCurrentContext:EAGLCTX]) {
         SkDebugf("Could not set the context.\n");
     }
 }
 
-void SkNativeGLContext::swapBuffers() const { }
+void SkNativeGLContextIOS::swapBuffers() const { }
+
+} // anonymous namespace
+
+
+SkNativeGLContext* SkCreateGLContext() {
+    return SkNEW(SkNativeGLContextIOS);
+}
+