Add TextureView.getBitmap()

This API can be used to get a Bitmap copy of the content of a
TextureView.

Change-Id: I07522216c353720fba5cab333174f58f484eb911
diff --git a/libs/hwui/LayerRenderer.h b/libs/hwui/LayerRenderer.h
index 59cab96..797dfc6 100644
--- a/libs/hwui/LayerRenderer.h
+++ b/libs/hwui/LayerRenderer.h
@@ -20,6 +20,8 @@
 #include "OpenGLRenderer.h"
 #include "Layer.h"
 
+#include <SkBitmap.h>
+
 namespace android {
 namespace uirenderer {
 
@@ -60,6 +62,7 @@
             GLenum renderTarget, float* transform);
     static void destroyLayer(Layer* layer);
     static void destroyLayerDeferred(Layer* layer);
+    static bool copyLayer(Layer* layer, SkBitmap* bitmap);
 
 private:
     void generateMesh();