Running 3 ProgGuard optimization passes

base/android/base_proguard_config.flags

 # Keep line number information, useful for stack traces.
 -keepattributes SourceFile,LineNumberTable
 
 # Keep all runtime visible annotations
 -keepattributes RuntimeVisibleAnnotations
 
 # Keep the annotations, because if we don't, the ProGuard rules that use them
 # will not be respected. These classes then show up in our final dex, which we
 # do not want - see crbug.com/628226.
 -keep @interface org.chromium.base.annotations.AccessedByNative
@@ skipping 32 matching lines @@
 
 # Allows Proguard freedom in removing these log related calls. We ask for debug
 # and verbose logs to be stripped out in base.Log, so we are just ensuring we
 # get rid of all other debug/verbose logs.
 -assumenosideeffects class android.util.Log {
   static *** d(...);
   static *** v(...);
   static *** isLoggable(...);
 }
 
+# The following chart was created on July 20, 2016, to decide on 3 optimization
+# passes.
+# optimization passes | time | .dex size | dirty memory per process
+# -----------------------------------------------------------------
+#          1          | 0:48 |  5805676  |         488972
+#          2          | 1:07 |  5777376  |         487092
+#          3          | 1:24 |  5772192  |         486596
+#          4          | 1:42 |  5771124  |         486484
+#          5          | 1:56 |  5770504  |         486432
+-optimizationpasses 3
+
 # Class merging provides negligible .dex size reduction and method count
 # reduction (about 0.3% improvement on method count, and 0.1% savings on size),
 # and it messes up stack traces if the classes are optimized. Thus, it is in our
 # best interests to turn it off. See crbug.com/620323
 -optimizations !class/merging/*
 
 # Allowing Proguard to change modifiers. This change shrinks the .dex size by
 # ~1.1%, and reduces the method count by ~4.3%.
 -allowaccessmodification
 
 # Keep all enum values and valueOf methods. See
 # http://proguard.sourceforge.net/index.html#manual/examples.html
 # for the reason for this. Also, see http://crbug.com/248037.
 -keepclassmembers enum * {
     public static **[] values();
     public static ** valueOf(java.lang.String);
 }