Turning on optimizations for chromium code

chrome/android/java/proguard.flags

 # Keep line number information, useful for stack traces.
 -keepattributes SourceFile,LineNumberTable
 
 # Keep the annotations.
 -keep @interface ***
 
 # Disable obfuscation for the following two packages.
--keepnames class com.google.android.apps.chrome.**,org.chromium.** {
+-keepnames,allowoptimization class com.google.android.apps.chrome.**,org.chromium.** {
   *;
 }
 
 # Keep all the primitive and String constants for for the following two packages.
 -keepclassmembers class com.google.android.apps.chrome.**,org.chromium.** {
   !private static final % *;
   !private static final java.lang.String *;
 }
 
 # Fragments are loaded using reflection via Fragment.instantiate(Context,String)
@@ skipping 204 matching lines @@
 # Needed for chrome_sync_shell_test_apk. Note - these do no affect chrome_apk's
 # size.
 -keep class org.chromium.sync.protocol.* { *; }
 
 # These resources are referenced in tests, but not in the real application.
 -keepclassmembers class org.chromium.chrome.R$id {
   int webapp_splash_space;
   int mr_chooser_list;
   int find_toolbar;
 }