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/ProgramCache.cpp b/libs/hwui/ProgramCache.cpp
index 3cd85c8..f2f1adb 100644
--- a/libs/hwui/ProgramCache.cpp
+++ b/libs/hwui/ProgramCache.cpp
@@ -456,11 +456,11 @@
         }
 
         if (fast) {
-            if (DEBUG_PROGRAM_CACHE) {
+#if DEBUG_PROGRAMS
                 PROGRAM_LOGD("*** Fast case:\n");
                 PROGRAM_LOGD("*** Generated fragment shader:\n\n");
                 printLongString(shader);
-            }
+#endif
 
             return shader;
         }
@@ -542,10 +542,10 @@
     // End the shader
     shader.append(gFS_Footer);
 
-    if (DEBUG_PROGRAM_CACHE) {
+#if DEBUG_PROGRAMS
         PROGRAM_LOGD("*** Generated fragment shader:\n\n");
         printLongString(shader);
-    }
+#endif
 
     return shader;
 }