Preparing for ProGuard obfuscation

chrome/android/java/proguard.flags

+# As of August 11, 2016, obfuscation was tested and passed on the trybots,
+# saving us 660kb on our .dex size and 53kb memory/process. Enable obfuscation
+# as soon as Crash supports ReTrace's deobfuscation of stack traces.
+#
+# To enable obfuscation, remove the -keepnames rule for
+# com.google.android.apps.chrome.** and org.chromium.**, and uncomment the
+# following two lines:
+# -renamesourcefileattribute PG
+# -repackageclasses ""
+
 # Disable obfuscation for the following two packages.
 -keepnames,allowoptimization class com.google.android.apps.chrome.**,org.chromium.** {
   *;
 }
 
 # Fragments are loaded using reflection via Fragment.instantiate(Context,String)
 # This can be improved upon - see crbug.com/622023.
 -keep public class com.google.android.apps.chrome** extends android.app.Fragment
 -keep public class org.chromium** extends android.app.Fragment
 
 # Keep protobuf code used via reflection
 # TODO(tonyg): Removing these -keeps results in new notes, but nothing seems to
 # break. This exclusion costs almost 100k of dex size so consider replacing it
 # with a -dontnote after more testing.
 -keep class com.google.protobuf.** {
   *** newBuilder();
   *** parseFrom(java.io.InputStream);
 }
 
 # Keep the client interfaces for cacheinvalidation as they are used as
 # argument types for some of our code that we're keeping and proguard warns
 # otherwise.
 -keep class com.google.ipc.invalidation.external.client.** {
   *;
 }
 
+# These classes aren't themselves referenced, but __ProcessService[0,1,2...] are
+# referenced, and we look up these services by appending a number onto the name
+# of the base class. Thus, we need to keep the base class name around so that
+# the child classes can be looked up.
+-keep class org.chromium.content.app.SandboxedProcessService
+-keep class org.chromium.content.app.PrivilegedProcessService
+
 # Keep all Parcelables as they might be marshalled outside Chrome.
 -keepnames class * implements android.os.Parcelable {
    public static final ** CREATOR;
 }
 
 # SearchView is used in website_preferences_menu.xml and is constructed by
 # Android using reflection.
 -keep class android.support.v7.widget.SearchView {
   public <init>(...);
 }
 
 # Google Play Services warnings are about its resources.
 -dontwarn com.google.android.gms.R**
 
 # The support library contains references to newer platform versions.
 # Don't warn about those in case this app is linking against an older
 # platform version.  We know about them, and they are safe.
 -dontwarn android.support.**
 
 # Proguard mistakenly optimizes away some null checks on final fields
 # in the support library.
 # See https://sourceforge.net/p/proguard/bugs/531/#fdc9/41e2
 -keepclassmembers,allowshrinking,allowobfuscation class android.support.v7.widget.AppCompatButton {
   !static final <fields>;
 }