Add GrTextureProxyPriv

Several upcoming additions should go in here

Change-Id: I642f3c7cc36b1e6512ee0170640449e88a666d2c
Reviewed-on: https://skia-review.googlesource.com/52661
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

gn/gpu.gni

@@ -186,6 +186,7 @@ skia_gpu_sources = [
   "$_src/gpu/GrTextureOpList.cpp",
   "$_src/gpu/GrTextureOpList.h",
   "$_src/gpu/GrTextureProxyCacheAccess.h",
+  "$_src/gpu/GrTextureProxyPriv.h",
   "$_src/gpu/GrTracing.h",
   "$_src/gpu/GrTestUtils.cpp",
   "$_src/gpu/GrTestUtils.h",

include/private/GrSurfaceProxy.h

@@ -332,8 +332,8 @@ public:
     SkDEBUGCODE(void validate(GrContext*) const;)
 
     // Provides access to functions that aren't part of the public API.
-    GrSurfaceProxyPriv priv();
-    const GrSurfaceProxyPriv priv() const;
+    inline GrSurfaceProxyPriv priv();
+    inline const GrSurfaceProxyPriv priv() const;
 
 protected:
     // Deferred version

include/private/GrTextureProxy.h

@@ -15,6 +15,7 @@ class GrCaps;
 class GrResourceCache;
 class GrResourceProvider;
 class GrTextureOpList;
+class GrTextureProxyPriv;
 
 // This class delays the acquisition of textures until they are actually required
 class GrTextureProxy : virtual public GrSurfaceProxy {
@@ -62,6 +63,10 @@ public:
     inline CacheAccess cacheAccess();
     inline const CacheAccess cacheAccess() const;
 
+    // Provides access to special purpose functions.
+    GrTextureProxyPriv texPriv();
+    const GrTextureProxyPriv texPriv() const;
+
 protected:
     friend class GrSurfaceProxy; // for ctors
 

src/gpu/GrTextureProxyPriv.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2017 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrTextureProxyPriv_DEFINED
+#define GrTextureProxyPriv_DEFINED
+
+#include "GrTextureProxy.h"
+
+/**
+ * This class hides the more specialized capabilities of GrTextureProxy.
+ */
+class GrTextureProxyPriv {
+public:
+
+private:
+    explicit GrTextureProxyPriv(GrTextureProxy* textureProxy) : fTextureProxy(textureProxy) {}
+    GrTextureProxyPriv(const GrTextureProxyPriv&) {} // unimpl
+    GrTextureProxyPriv& operator=(const GrTextureProxyPriv&); // unimpl
+
+    // No taking addresses of this type.
+    const GrTextureProxyPriv* operator&() const;
+    GrTextureProxyPriv* operator&();
+
+    GrTextureProxy* fTextureProxy;
+
+    friend class GrTextureProxy;  // to construct/copy this type.
+};
+
+inline GrTextureProxyPriv GrTextureProxy::texPriv() { return GrTextureProxyPriv(this); }
+
+inline const GrTextureProxyPriv GrTextureProxy::texPriv() const {
+    return GrTextureProxyPriv(const_cast<GrTextureProxy*>(this));
+}
+
+#endif