Fix build breakage in HWUI JNI

R=djsollen@google.com

Change-Id: Iaa4e7f22bec8e15748beab1b25d307c48d277c59
diff --git a/libs/hwui/SkiaShader.h b/libs/hwui/SkiaShader.h
index a3755425..e110ca5 100644
--- a/libs/hwui/SkiaShader.h
+++ b/libs/hwui/SkiaShader.h
@@ -24,12 +24,15 @@
 
 #include <cutils/compiler.h>
 
+#include "Matrix.h"
+
 namespace android {
 namespace uirenderer {
 
 class Caches;
 class Extensions;
 class Layer;
+struct ProgramDescription;
 
 /**
  * Type of Skia shader in use.