Add support for creating texture backed images where Skia will delete the texture.

src/gpu/GrResourceCache.cpp

Index: src/gpu/GrResourceCache.cpp
diff --git a/src/gpu/GrResourceCache.cpp b/src/gpu/GrResourceCache.cpp
index ae9c68f3c4f1d69264340c2ad1efe378c7b0eb1a..88128ac5000fdfb651b21d0ca2f39751f6738be1 100644
--- a/src/gpu/GrResourceCache.cpp
+++ b/src/gpu/GrResourceCache.cpp
@@ -146,7 +146,7 @@ void GrResourceCache::insertResource(GrGpuResource* resource) {
 #endif
     }
     if (resource->resourcePriv().getScratchKey().isValid()) {
-        SkASSERT(!resource->cacheAccess().isWrapped());
+        SkASSERT(!resource->cacheAccess().isExternal());
         fScratchMap.insert(resource->resourcePriv().getScratchKey(), resource);
     }
 
@@ -369,7 +369,7 @@ void GrResourceCache::notifyCntReachedZero(GrGpuResource* resource, uint32_t fla
 
     if (!resource->resourcePriv().isBudgeted()) {
         // Check whether this resource could still be used as a scratch resource.
-        if (!resource->cacheAccess().isWrapped() &&
+        if (!resource->cacheAccess().isExternal() &&
             resource->resourcePriv().getScratchKey().isValid()) {
             // We won't purge an existing resource to make room for this one.
             if (fBudgetedCount < fMaxCount &&
@@ -645,19 +645,19 @@ void GrResourceCache::validate() const {
                 SkASSERT(!resource->getUniqueKey().isValid());
                 ++fScratch;
                 SkASSERT(fScratchMap->countForKey(resource->resourcePriv().getScratchKey()));
-                SkASSERT(!resource->cacheAccess().isWrapped());
+                SkASSERT(!resource->cacheAccess().isExternal());
             } else if (resource->resourcePriv().getScratchKey().isValid()) {
                 SkASSERT(!resource->resourcePriv().isBudgeted() ||
                          resource->getUniqueKey().isValid());
                 ++fCouldBeScratch;
                 SkASSERT(fScratchMap->countForKey(resource->resourcePriv().getScratchKey()));
-                SkASSERT(!resource->cacheAccess().isWrapped());
+                SkASSERT(!resource->cacheAccess().isExternal());
             }
             const GrUniqueKey& uniqueKey = resource->getUniqueKey();
             if (uniqueKey.isValid()) {
                 ++fContent;
                 SkASSERT(fUniqueHash->find(uniqueKey) == resource);
-                SkASSERT(!resource->cacheAccess().isWrapped());
+                SkASSERT(!resource->cacheAccess().isExternal());
                 SkASSERT(resource->resourcePriv().isBudgeted());
             }