Rename GrContentKey to GrUniqueKey

src/gpu/GrGpuResourceCacheAccess.h

Index: src/gpu/GrGpuResourceCacheAccess.h
diff --git a/src/gpu/GrGpuResourceCacheAccess.h b/src/gpu/GrGpuResourceCacheAccess.h
index 52294cef90e99fa56bd0613f610510f727ffdb56..df0ca34bcad76a2c2667a057b6314a57679a34c9 100644
--- a/src/gpu/GrGpuResourceCacheAccess.h
+++ b/src/gpu/GrGpuResourceCacheAccess.h
@@ -23,10 +23,10 @@ class GrGpuResource::CacheAccess {
 private:
     /**
      * Is the resource currently cached as scratch? This means it is cached, has a valid scratch
-     * key, and does not have a content key.
+     * key, and does not have a unique key.
      */
     bool isScratch() const {
-        return !fResource->getContentKey().isValid() && fResource->fScratchKey.isValid() &&
+        return !fResource->getUniqueKey().isValid() && fResource->fScratchKey.isValid() &&
                 fResource->resourcePriv().isBudgeted();
     }