Cleaner external buffer handling in SkWriter32

include/core/SkTDArray.h

Index: include/core/SkTDArray.h
diff --git a/include/core/SkTDArray.h b/include/core/SkTDArray.h
index 14447217e93416626d06d820d0b2b0d58d441987..fc546ac717faf7b12a2a0aebac57910435846e36 100644
--- a/include/core/SkTDArray.h
+++ b/include/core/SkTDArray.h
@@ -101,6 +101,11 @@ public:
     int count() const { return fCount; }
 
     /**
+     *  Return the number of elements there is space for without growing.

[reed1, 2014/02/06 20:14:40]

// This includes however many elements may already have been added

or

// This is the number of remaining "slots" that have been allocated but not
accounted for

or

// reserved() - count() is the number of additional slots that have been
allocated but not "used" yet.

or ?

[iancottrell, 2014/02/06 21:33:06]

Done. Is this better?

[reed1, 2014/02/06 21:41:34]

If I add 3 elements, and call reserve() and it returns 5, can I add 5 more or 2
more without growing?

+     */
+    int reserved() const { return fReserve; }
+
+    /**
      *  return the number of bytes in the array: count * sizeof(T)
      */
     size_t bytes() const { return fCount * sizeof(T); }