Convert DisplayList to a value-type wrapper

Make DisplayList its own type instead of an alias,
pushing the Skia aspect behind it mostly. Removes a bunch
of manual memory management and opens the door to DisplayList
being a union type with multiple implementations

Test: builds (somehow), boots, hwuiunit passes, CtsUiRendering passes
Change-Id: I1d7806aa3afc5d9ece08b06959920078a5814c59
diff --git a/libs/hwui/jni/Bitmap.cpp b/libs/hwui/jni/Bitmap.cpp
index eb9885a..05278f2 100755
--- a/libs/hwui/jni/Bitmap.cpp
+++ b/libs/hwui/jni/Bitmap.cpp
@@ -3,11 +3,12 @@
 #include "Bitmap.h"
 
 #include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkColor.h"
+#include "SkColorSpace.h"
 #include "SkPixelRef.h"
 #include "SkImageEncoder.h"
 #include "SkImageInfo.h"
-#include "SkColor.h"
-#include "SkColorSpace.h"
 #include "GraphicsJNI.h"
 #include "SkStream.h"
 #include "SkWebpEncoder.h"