Add display lists caching.

Change-Id: Iac3a248a81ed8cb076a83ef9d186b8ebba685b4c
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index d505d80..1974cf0 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -54,6 +54,8 @@
 // Renderer
 ///////////////////////////////////////////////////////////////////////////////
 
+class DisplayListRenderer;
+
 /**
  * OpenGL renderer used to draw accelerated 2D graphics. The API is a
  * simplified version of Skia's Canvas API.
@@ -63,7 +65,7 @@
     OpenGLRenderer();
     virtual ~OpenGLRenderer();
 
-    void setViewport(int width, int height);
+    virtual void setViewport(int width, int height);
 
     virtual void prepare();
     virtual void finish();
@@ -428,6 +430,8 @@
     // Misc
     GLint mMaxTextureSize;
 
+    friend class DisplayListRenderer;
+
 }; // class OpenGLRenderer
 
 }; // namespace uirenderer