Add debug mode to measure performance.

Change-Id: I9d4c84034dc200b99c8266165942a7cdbcb5c0c5
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index e032085..dbd499e 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -24,6 +24,7 @@
 #include <SkTypeface.h>
 
 #include <utils/Log.h>
+#include <utils/StopWatch.h>
 
 #include "OpenGLRenderer.h"
 
@@ -710,6 +711,7 @@
     if (text == NULL || count == 0 || (paint->getAlpha() == 0 && paint->getXfermode() == NULL)) {
         return;
     }
+
     paint->setAntiAlias(true);
 
     float length = -1.0f;
@@ -739,6 +741,7 @@
     FontRenderer& fontRenderer = mCaches.fontRenderer.getFontRenderer(paint);
     fontRenderer.setFont(paint, SkTypeface::UniqueID(paint->getTypeface()),
             paint->getTextSize());
+
     if (mHasShadow) {
         glActiveTexture(gTextureUnits[0]);
         mCaches.dropShadowCache.setFontRenderer(fontRenderer);