Fix leak of SkImageGenerator

dm/DMSrcSink.cpp

Index: dm/DMSrcSink.cpp
diff --git a/dm/DMSrcSink.cpp b/dm/DMSrcSink.cpp
index 057b6ae480c857460fa81683211eea349e6eaae3..5b20e3959fbb0dcb95148c088868cc2cd09c8cb6 100644
--- a/dm/DMSrcSink.cpp
+++ b/dm/DMSrcSink.cpp
@@ -279,7 +279,7 @@ bool get_decode_info(SkImageInfo* decodeInfo, const SkImageInfo& defaultInfo,
 }
 
 Error test_gen(SkCanvas* canvas, SkData* data) {
-    SkImageGenerator* gen = SkCodecImageGenerator::NewFromEncodedCodec(data);
+    SkAutoTDelete<SkImageGenerator> gen = SkCodecImageGenerator::NewFromEncodedCodec(data);
     if (!gen) {
         return "Could not create image generator.";
     }
@@ -293,7 +293,7 @@ Error test_gen(SkCanvas* canvas, SkData* data) {
         return Error::Nonfatal("Skip testing non-opaque images to 565.");
     }
 
-    SkAutoTDelete<SkImage> image(SkImage::NewFromGenerator(gen, nullptr));
+    SkAutoTDelete<SkImage> image(SkImage::NewFromGenerator(gen.detach(), nullptr));

[djsollen, 2016/01/25 18:34:07]

why do you need to detach here?  Does SkImage promise to delete the generator
for us?

     if (!image) {
         return "Could not create image from codec image generator.";
     }