Adding new shared config for Chrome and WebView

chrome/android/java/proguard.flags

Index: chrome/android/java/proguard.flags
diff --git a/chrome/android/java/proguard.flags b/chrome/android/java/proguard.flags
index 12830c1bb020371d16065091ee23608118680ca8..5db0925c1974dc2b8ff9f885e69e2fb11cd927cd 100644
--- a/chrome/android/java/proguard.flags
+++ b/chrome/android/java/proguard.flags
@@ -13,34 +13,6 @@
   *;
 }
 
-# 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 messes up stacktraces beyond the point of them being
-# deobfuscatable. If turned on, it would give us a 2% reduction in .dex size.
--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
-
-# 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(...);
-}
-
 # 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
@@ -66,8 +38,3 @@
 
 # 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.**