Turning on optimizations for chromium code

build/config/android/internal_rules.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/android/config.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 assert(is_android)
 
 # These identify targets that have .build_config files (except for android_apk,
@@ skipping 683 matching lines @@
       ]
       foreach(c, _input_jars_paths) {
         args += [ "--classpath=" + rebase_path(c, root_build_dir) ]
       }
       if (proguard_verbose) {
         args += [ "--verbose" ]
       }
       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" ]
+      }
     }
   }
 
   template("findbugs") {
     action(target_name) {
       forward_variables_from(invoker,
                              [
                                "deps",
                                "testonly",
                              ])
@@ skipping 1826 matching lines @@
       outputs = [
         depfile,
         invoker.out_manifest,
       ]
       inputs = [
         invoker.main_manifest,
       ]
     }
   }
 }