Share Caches' index buffer with FontRenderer

This reduces state changes when we draw 9patches and text together,
which happens *a lot*. Also disable the NV profiling extension by
default since it doesn't play nice with display lists deferrals.
To enable it set debug.hwui.nv_profiling to true.

Change-Id: I518b44b7d294e5def10c78911ceb9f01ae401609
diff --git a/libs/hwui/Properties.h b/libs/hwui/Properties.h
index dbbb956..86b0aa2 100644
--- a/libs/hwui/Properties.h
+++ b/libs/hwui/Properties.h
@@ -76,6 +76,12 @@
 #define PROPERTY_DEBUG_OVERDRAW "debug.hwui.overdraw"
 
 /**
+ * Used to enable/disable PerfHUD ES profiling. The accepted values
+ * are "true" and "false". The default value is "false".
+ */
+#define PROPERTY_DEBUG_NV_PROFILING "debug.hwui.nv_profiling"
+
+/**
  * Used to enable/disable non-rectangular clipping debugging.
  *
  * The accepted values are: