Adding a new SkSurface factory for generating surfaces from the scratch texture pool.

src/gpu/GrResourceCache.h

Index: src/gpu/GrResourceCache.h
diff --git a/src/gpu/GrResourceCache.h b/src/gpu/GrResourceCache.h
index 41c6b516b97a476dd4c5b43281eae1d392d605f4..b5953032f617b5e036fede5bffd1828b16e9dba6 100644
--- a/src/gpu/GrResourceCache.h
+++ b/src/gpu/GrResourceCache.h
@@ -213,6 +213,11 @@ public:
      */
     size_t getCachedResourceBytes() const { return fEntryBytes; }
 
+    /**
+     * Returns the number of cached resources.
+     */
+    int getCachedResourceCount() const { return fEntryCount; }
+
     // For a found or added resource to be completely exclusive to the caller
     // both the kNoOtherOwners and kHide flags need to be specified
     enum OwnershipFlags {