Turning on optimizations for chromium code

build/config/android/internal_rules.gni

Index: build/config/android/internal_rules.gni
diff --git a/build/config/android/internal_rules.gni b/build/config/android/internal_rules.gni
index 22093c12bda464d9e36c5c1cced89f72455d8e5b..d787d0e58a790dbb7c5d28bd136fe9c0ac6f1496 100644
--- a/build/config/android/internal_rules.gni
+++ b/build/config/android/internal_rules.gni
@@ -701,6 +701,11 @@ if (enable_java_templates) {
       if (defined(invoker.args)) {
         args += invoker.args
       }
+      if (defined(invoker.proguard_jar_path)) {
+        # We assume that if we are using a different ProGuard, this new version
+        # can handle the 'dangerous' optimizaions.
+        args += [ "--enable-dangerous-optimizations" ]
+      }
     }
   }