Revert of By default purge resources that haven't been used for 64 flushes

src/gpu/GrResourceCache.h

Index: src/gpu/GrResourceCache.h
diff --git a/src/gpu/GrResourceCache.h b/src/gpu/GrResourceCache.h
index 67aa4e941a88e81539bb78c0a66be1467e19f6ec..2171420a43f696fcde1c7dce1c9a7a6be157fbd8 100644
--- a/src/gpu/GrResourceCache.h
+++ b/src/gpu/GrResourceCache.h
@@ -57,8 +57,9 @@
     static const size_t kDefaultMaxSize             = 96 * (1 << 20);
     // Default number of flushes a budgeted resources can go unused in the cache before it is
     // purged. Large values disable the feature (as the ring buffer of flush timestamps would be
-    // large).
-    static const int    kDefaultMaxUnusedFlushes    = 64;
+    // large). This is currently the default until we decide to enable this feature
+    // of the cache by default.
+    static const int    kDefaultMaxUnusedFlushes    = 1024;
 
     /** Used to access functionality needed by GrGpuResource for lifetime management. */
     class ResourceAccess;