Reimplement gpu message bus for invalidated bitmap gen IDs

src/gpu/GrGpuResourceCacheAccess.h

 
 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpuResourceCacheAccess_DEFINED
 #define GrGpuResourceCacheAccess_DEFINED
@@ skipping 10 matching lines @@
      * Sets a content key for the resource. If the resource was previously cached as scratch it will
      * be converted to a content resource. Currently this may only be called once per resource. It
      * fails if there is already a resource with the same content key. TODO: make this supplant the
      * resource that currently is using the content key, allow resources' content keys to change,
      * and allow removal of a content key to convert a resource back to scratch.
      */
     bool setContentKey(const GrContentKey& contentKey) {
         return fResource->setContentKey(contentKey);
     }
 
+    void removeContentKey() { return fResource->removeContentKey(); }
+
     /**
      * Is the resource currently cached as scratch? This means it is cached, has a valid scratch
      * key, and does not have a content key.
      */
     bool isScratch() const {
         return !fResource->getContentKey().isValid() && fResource->fScratchKey.isValid() &&
                 this->isBudgeted();
     }
 
     /** 
@@ skipping 69 matching lines @@
     friend class GrGpuResource; // to construct/copy this type.
 };
 
 inline GrGpuResource::CacheAccess GrGpuResource::cacheAccess() { return CacheAccess(this); }
 
 inline const GrGpuResource::CacheAccess GrGpuResource::cacheAccess() const {
     return CacheAccess(const_cast<GrGpuResource*>(this));
 }
 
 #endif