Fixed Android.common.mk #define setting for small art

We were seeing things compile when they shouldn't have. This fixes it.  Plus added
a bit more documentation to options, set default values for the two small art related
thresholds to zero.

Change-Id: Id5db11962f3e30d8d4ee6b85d4cf7d6e66323adb
diff --git a/src/runtime.h b/src/runtime.h
index 0ada0a2..6f03fe0 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -61,8 +61,13 @@
  public:
   typedef std::vector<std::pair<std::string, const void*> > Options;
 
-  static const size_t kDefaultSmallModeMethodThreshold = 30;
-  static const size_t kDefaultSmallModeMethodDexSizeLimit = 100;
+  // In small mode, apps with fewer than this number of methods will be compiled 
+  // anyways.
+  static const size_t kDefaultSmallModeMethodThreshold = 0;
+
+  // In small mode, methods smaller than this dex op count limit will get compiled
+  // anyways.
+  static const size_t kDefaultSmallModeMethodDexSizeLimit = 0;
 
   class ParsedOptions {
    public: