Fix assert_premultiplied assert

Fix assert_premultiplied triggered, when a hardware bitmap is
created. This happens for both pipelines.

Test: Ran CtsUiRenderingTestCases.
Change-Id: Iffe71a560466b672f755708354535ba8affcced2
diff --git a/core/jni/android_view_ThreadedRenderer.cpp b/core/jni/android_view_ThreadedRenderer.cpp
index 46b0a79..cc738f9 100644
--- a/core/jni/android_view_ThreadedRenderer.cpp
+++ b/core/jni/android_view_ThreadedRenderer.cpp
@@ -923,7 +923,8 @@
         // Continue I guess?
     }
     sk_sp<Bitmap> bitmap = Bitmap::createFrom(buffer);
-    return createBitmap(env, bitmap.release(), android::bitmap::kBitmapCreateFlag_Mutable);
+    return bitmap::createBitmap(env, bitmap.release(),
+            android::bitmap::kBitmapCreateFlag_Premultiplied);
 }
 
 static void android_view_ThreadedRenderer_disableVsync(JNIEnv*, jclass) {