Rewrite SkTRegistry to take any trivially-copyable type.

Obviously these are all currently function pointers of type T(*)(P) for various
T and P.  In bench refactoring, I'm trying to register a function pointer of
type T(*)(), which can't be done as is (passing P=void doesn't work).  This
also lets us register things like primitives, which is conceivable useful.

BUG=
R=reed@google.com, scroggo@google.com

Review URL: https://codereview.chromium.org/23453031

git-svn-id: http://skia.googlecode.com/svn/trunk@11082 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/bench/SkBenchmark.h b/bench/SkBenchmark.h
index 404d4c3..7ebe104 100644
--- a/bench/SkBenchmark.h
+++ b/bench/SkBenchmark.h
@@ -154,6 +154,6 @@
     typedef SkRefCnt INHERITED;
 };
 
-typedef SkTRegistry<SkBenchmark*, void*> BenchRegistry;
+typedef SkTRegistry<SkBenchmark*(*)(void*)> BenchRegistry;
 
 #endif