SkStream is no longer a ref counted object.

With https://codereview.chromium.org/849103004/, SkStream is no longer
ref counted. Change callers that currently unref() SkStreams to one of
either:
- delete the stream
- pass ownership of the stream

screencap.cpp:
Call EncodeData directly, bypassing SkDynamicMemoryWStream and SkBitmap.

Utils.cpp:
Write directly to an SkData, and then use that to construct a new
SkStream.

Cherry-pick of a change that originally landed in master-skia and is
dependent on a skia merge (ag/655422).

Change-Id: Idc99ad7d5a70c893dc012d59915216f301ab3c9d

cmds/screencap/screencap.cpp

@@ -36,9 +36,7 @@
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
 #include <SkImageEncoder.h>
-#include <SkBitmap.h>
 #include <SkData.h>
-#include <SkStream.h>
 #pragma GCC diagnostic pop
 
 using namespace android;
@@ -198,14 +196,11 @@ int main(int argc, char** argv)
         if (png) {
             const SkImageInfo info = SkImageInfo::Make(w, h, flinger2skia(f),
                                                        kPremul_SkAlphaType);
-            SkBitmap b;
-            b.installPixels(info, const_cast<void*>(base), s*bytesPerPixel(f));
-            SkDynamicMemoryWStream stream;
-            SkImageEncoder::EncodeStream(&stream, b,
-                    SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality);
-            SkData* streamData = stream.copyToData();
-            write(fd, streamData->data(), streamData->size());
-            streamData->unref();
+            SkAutoTUnref<SkData> data(SkImageEncoder::EncodeData(info, base, s*bytesPerPixel(f),
+                    SkImageEncoder::kPNG_Type, SkImageEncoder::kDefaultQuality));
+            if (data.get()) {
+                write(fd, data->data(), data->size());
+            }
             if (fn != NULL) {
                 notifyMediaScanner(fn);
             }