Add guards to GrTextureProvider

include/gpu/GrTextureProvider.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrTextureProvider_DEFINED
 #define GrTextureProvider_DEFINED
 
 #include "GrTexture.h"
 #include "SkImageFilter.h"
 
+class GrSingleOwner;
+
 class SK_API GrTextureProvider {
 public:
     ///////////////////////////////////////////////////////////////////////////
     // Textures
 
     /**
      * Creates a new texture in the resource cache and returns it. The caller owns a
      * ref on the returned texture which must be balanced by a call to unref.
      *
      * @param desc      Description of the texture properties.
@@ skipping 103 matching lines @@
      * similar to wrapBackendTexture but can be used to draw into surfaces
      * that are not also textures (e.g. FBO 0 in OpenGL, or an MSAA buffer that
      * the client will resolve to a texture). Currently wrapped render targets
      * always use the kBorrow_GrWrapOwnership semantics.
      *
      * @return GrTexture object or NULL on failure.
      */
      GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc& desc);
 
 protected:
-    GrTextureProvider(GrGpu* gpu, GrResourceCache* cache) : fCache(cache), fGpu(gpu) {}
+    GrTextureProvider(GrGpu* gpu, GrResourceCache* cache, GrSingleOwner* singleOwner)
+        : fCache(cache)
+        , fGpu(gpu)
+        , fSingleOwner(singleOwner) {}
 
     /**
      * Assigns a unique key to a resource. If the key is associated with another resource that
      * association is removed and replaced by this resource.
      */
     void assignUniqueKeyToResource(const GrUniqueKey&, GrGpuResource*);
 
     /**
      * Finds a resource in the cache, based on the specified key. This is intended for use in
      * conjunction with addResourceToCache(). The return value will be NULL if not found. The
@@ skipping 30 matching lines @@
     GrGpu* gpu() { return fGpu; }
     const GrGpu* gpu() const { return fGpu; }
 
     bool isAbandoned() const {
         SkASSERT(SkToBool(fGpu) == SkToBool(fCache));
         return !SkToBool(fCache);
     }
 
 private:
     GrResourceCache* fCache;
     GrGpu* fGpu;

[robertphillips, 2016/01/07 19:07:02]

// Guard for single-threaded access. Owned by GrContext.

?

+    GrSingleOwner* fSingleOwner;
 };
 
 #endif