deprecate odd variants of SkCanvas::readPixels

Bug: skia:6513
Change-Id: I51179a85f0912d3f899c368c30a943d346dd1d05
Reviewed-on: https://skia-review.googlesource.com/13589
Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/samplecode/SampleApp.cpp b/samplecode/SampleApp.cpp
index ce97024..feace00 100644
--- a/samplecode/SampleApp.cpp
+++ b/samplecode/SampleApp.cpp
@@ -1064,7 +1064,7 @@
 static SkBitmap capture_bitmap(SkCanvas* canvas) {
     SkBitmap bm;
     if (bm.tryAllocPixels(canvas->imageInfo())) {
-        canvas->readPixels(&bm, 0, 0);
+        canvas->readPixels(bm, 0, 0);
     }
     return bm;
 }