Revert of Use presence of a content key as non-scratch indicator

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 6ece67fd10a19beb1e00fa8debfa1ad4d63878a8..a722eed88ac5cac8a663adbe9f7fc14ac1d6315d 100755
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -5,6 +5,7 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+
 
 #include "GrContext.h"
 
@@ -443,6 +444,7 @@
         return NULL;
     }
     fResourceCache->addResource(texture->getScratchKey(), texture);
+    texture->fIsScratch = GrGpuResource::kYes_IsScratch;
     return texture;
 }