SkPDF: Implement drawImage*() properly

include/private/SkTHash.h

Index: include/private/SkTHash.h
diff --git a/include/private/SkTHash.h b/include/private/SkTHash.h
index 53d52754bd36340db546c92b0d8309f90cdee5f2..db6709a5086863ffbb1b081384e7184afda625b5 100644
--- a/include/private/SkTHash.h
+++ b/include/private/SkTHash.h
@@ -242,6 +242,12 @@ public:
         fTable.foreach([&fn](const Pair& p){ fn(p.key, p.val); });
     }
 
+    // Call fn on every value in the table.  You may not mutate anything.
+    template <typename Fn>  // f(const V&) or f(V)
+    void foreachValue(Fn&& fn) const {

[mtklein, 2015/09/27 07:20:32]

What value does this add?  Can you not just ignore the key?

+        fTable.foreach([&fn](const Pair& p) { fn(p.val); });
+    }
+
 private:
     struct Pair {
         K key;