skia: Add support for CHROMIUM_image backed textures.

src/gpu/GrResourceCache.cpp

Index: src/gpu/GrResourceCache.cpp
diff --git a/src/gpu/GrResourceCache.cpp b/src/gpu/GrResourceCache.cpp
index 4a0c9b2b369bbc12cb4254dedeaae16b929454d6..2abe7e93530af2ad858890f77c741e62751ba980 100644
--- a/src/gpu/GrResourceCache.cpp
+++ b/src/gpu/GrResourceCache.cpp
@@ -375,25 +375,27 @@ void GrResourceCache::notifyCntReachedZero(GrGpuResource* resource, uint32_t fla
     this->removeFromNonpurgeableArray(resource);
     fPurgeableQueue.insert(resource);
 
-    if (!resource->resourcePriv().isBudgeted()) {
-        // Check whether this resource could still be used as a scratch resource.
-        if (!resource->cacheAccess().isExternal() &&
-            resource->resourcePriv().getScratchKey().isValid()) {
-            // We won't purge an existing resource to make room for this one.
-            if (fBudgetedCount < fMaxCount &&
-                fBudgetedBytes + resource->gpuMemorySize() <= fMaxBytes) {
-                resource->resourcePriv().makeBudgeted();
+    if (resource->reuseable()) {
+        if (!resource->resourcePriv().isBudgeted()) {
+            // Check whether this resource could still be used as a scratch resource.
+            if (!resource->cacheAccess().isExternal() &&
+                resource->resourcePriv().getScratchKey().isValid()) {
+                // We won't purge an existing resource to make room for this one.
+                if (fBudgetedCount < fMaxCount &&
+                    fBudgetedBytes + resource->gpuMemorySize() <= fMaxBytes) {
+                    resource->resourcePriv().makeBudgeted();
+                    return;
+                }
+            }
+        } else {
+            // Purge the resource immediately if we're over budget
+            // Also purge if the resource has neither a valid scratch key nor a unique key.
+            bool noKey = !resource->resourcePriv().getScratchKey().isValid() &&
+                         !resource->getUniqueKey().isValid();
+            if (!this->overBudget() && !noKey) {
                 return;
             }
         }
-    } else {
-        // Purge the resource immediately if we're over budget
-        // Also purge if the resource has neither a valid scratch key nor a unique key.
-        bool noKey = !resource->resourcePriv().getScratchKey().isValid() &&
-                     !resource->getUniqueKey().isValid();
-        if (!this->overBudget() && !noKey) {
-            return;
-        }
     }
 
     SkDEBUGCODE(int beforeCount = this->getResourceCount();)