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/tools/skiaserve/Request.cpp b/tools/skiaserve/Request.cpp
index 7c2b893..12f35968 100644
--- a/tools/skiaserve/Request.cpp
+++ b/tools/skiaserve/Request.cpp
@@ -46,9 +46,9 @@
 
 SkBitmap* Request::getBitmapFromCanvas(SkCanvas* canvas) {
     SkBitmap* bmp = new SkBitmap();
-    bmp->setInfo(canvas->imageInfo());
-    if (!canvas->readPixels(bmp, 0, 0)) {
+    if (!bmp->tryAllocPixels(canvas->imageInfo()) || !canvas->readPixels(*bmp, 0, 0)) {
         fprintf(stderr, "Can't read pixels\n");
+        delete bmp;
         return nullptr;
     }
     return bmp;