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/FontRenderer.h b/libs/hwui/FontRenderer.h
index a76cb86..7e749ca 100644
--- a/libs/hwui/FontRenderer.h
+++ b/libs/hwui/FontRenderer.h
@@ -169,6 +169,14 @@
         return mTextureId;
     }
 
+    uint32_t getCacheWidth() const {
+        return mCacheWidth;
+    }
+
+    uint32_t getCacheHeight() const {
+        return mCacheHeight;
+    }
+
 protected:
     friend class Font;
 
@@ -207,14 +215,6 @@
         }
     };
 
-    uint32_t getCacheWidth() const {
-        return mCacheWidth;
-    }
-
-    uint32_t getCacheHeight() const {
-        return mCacheHeight;
-    }
-
     void initTextTexture();
     bool cacheBitmap(const SkGlyph& glyph, uint32_t *retOriginX, uint32_t *retOriginY);