Move all debug flags in a single place.

This change also adds a new memory usage flag. When turned on, the
following is printed after every frame:

D/OpenGLRenderer( 3723): Current memory usage / total memory usage (bytes):
D/OpenGLRenderer( 3723):   TextureCache          3766680 / 20971520
D/OpenGLRenderer( 3723):   LayerCache            3538944 /  8388608
D/OpenGLRenderer( 3723):   GradientCache          135168 /   524288
D/OpenGLRenderer( 3723):   PathCache               41180 /  4194304
D/OpenGLRenderer( 3723):   TextDropShadowCache         0 /  2097152
D/OpenGLRenderer( 3723):   FontRenderer 0         262144 /   262144
D/OpenGLRenderer( 3723):   FontRenderer 1         262144 /   262144
D/OpenGLRenderer( 3723):   FontRenderer 2         262144 /   262144
D/OpenGLRenderer( 3723): Other:
D/OpenGLRenderer( 3723):   FboCache                    2 /       12
D/OpenGLRenderer( 3723):   PatchCache                 31 /      512
D/OpenGLRenderer( 3723): Total memory usage:
D/OpenGLRenderer( 3723):   8268404 bytes, 7.89 MB

This should help tracking possibe memory issues.

Change-Id: I83f483ca1d2dbef904829bce368e33fe5503e8d6
diff --git a/libs/hwui/TextureCache.h b/libs/hwui/TextureCache.h
index 5c314fc..2ee88b1 100644
--- a/libs/hwui/TextureCache.h
+++ b/libs/hwui/TextureCache.h
@@ -19,6 +19,7 @@
 
 #include <SkBitmap.h>
 
+#include "Debug.h"
 #include "Texture.h"
 #include "utils/GenerationCache.h"
 
@@ -30,9 +31,6 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 // Debug
-#define DEBUG_TEXTURES 0
-
-// Debug
 #if DEBUG_TEXTURES
     #define TEXTURE_LOGD(...) LOGD(__VA_ARGS__)
 #else