change params to getPaths callback, avoiding a xform/copy up front.

Before

  18/18  MB	1	33.1µs	33.3µs	33.4µs	34.2µs	1%	█▄▃▂▂▁▁▁▁▂	nonrendering	font-path-batch
  18/18  MB	12	43.7µs	43.8µs	43.8µs	44.1µs	0%	█▂▁▂▁▅▂▂▆▂	nonrendering	font-path-loop

After

  17/17  MB	1	10.2µs	10.3µs	10.4µs	11µs	2%	█▃▂▂▂▂▂▁▁▂	nonrendering	font-path-batch
  17/17  MB	21	23.4µs	23.4µs	23.4µs	23.4µs	0%	█▂▁▃▃▂▄▁▂▂	nonrendering	font-path-loop

Bug: skia:
Change-Id: Ib1aa886fd675326bf5936b47b0d459ba02f1681e
Reviewed-on: https://skia-review.googlesource.com/c/172743
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/bench/FontCacheBench.cpp b/bench/FontCacheBench.cpp
index 98caa2b..beae47a 100644
--- a/bench/FontCacheBench.cpp
+++ b/bench/FontCacheBench.cpp
@@ -184,9 +184,9 @@
                 }
             } else {
                 fFont.getPaths(fGlyphs, SK_ARRAY_COUNT(fGlyphs),
-                               [](uint16_t, const SkPath* src, void* ctx) {
+                               [](const SkPath* src, const SkMatrix& mx, void* ctx) {
                                    if (src) {
-                                       *static_cast<SkPath*>(ctx) = *src;
+                                       src->transform(mx, static_cast<SkPath*>(ctx));
                                    }
                                }, &path);
             }