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/tests/Test.h b/tests/Test.h
index 27b31df..1c89f98 100644
--- a/tests/Test.h
+++ b/tests/Test.h
@@ -86,7 +86,7 @@
     private:
     };
 
-    typedef SkTRegistry<Test*, void*> TestRegistry;
+    typedef SkTRegistry<Test*(*)(void*)> TestRegistry;
 }
 
 #define REPORTER_ASSERT(r, cond)                                        \