Creating new gn arg: enable_all_proguard_optimizations.

content/shell/android/BUILD.gn

 # 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/android/rules.gni")
 import("//build_overrides/v8.gni")
 import("//third_party/icu/config.gni")
 
 generate_jni("content_shell_jni_headers") {
@@ skipping 134 matching lines @@
     "//content/shell/android:content_shell_java",
   ]
   java_files = [
     "javatests/src/org/chromium/content_shell_apk/ContentShellPreconditionsTest.java",
     "javatests/src/org/chromium/content_shell_apk/ContentShellShellManagementTest.java",
     "javatests/src/org/chromium/content_shell_apk/ContentShellTestBase.java",
     "javatests/src/org/chromium/content_shell_apk/ContentShellUrlTest.java",
   ]
 }
 
-instrumentation_test_apk("content_shell_test_apk") {
-  deps = [
-    "//base:base_javatests",
-    "//content/public/android:content_javatests",
-    "//net/android:net_javatests",
-  ]
-  data_deps = [
-    ":content_shell_apk",
-  ]
-  apk_under_test = ":content_shell_apk"
-  apk_name = "ContentShellTest"
-  android_manifest = "javatests/AndroidManifest.xml"
-  isolate_file = "../../content_shell_test_data.isolate"
+if (!enable_all_proguard_optimizations) {
+  instrumentation_test_apk("content_shell_test_apk") {
+    deps = [
+      "//base:base_javatests",
+      "//content/public/android:content_javatests",
+      "//net/android:net_javatests",
+    ]
+    data_deps = [
+      ":content_shell_apk",
+    ]
+    apk_under_test = ":content_shell_apk"
+    apk_name = "ContentShellTest"
+    android_manifest = "javatests/AndroidManifest.xml"
+    isolate_file = "../../content_shell_test_data.isolate"
+  }
 }
 
 if (current_cpu != "x64") {
   chromium_linker_test_manifest =
       "$target_gen_dir/linker_test_apk/AndroidManifest.xml"
 
   jinja_template("chromium_linker_test_manifest") {
     testonly = true
     input = "linker_test_apk/AndroidManifest.xml.jinja2"
     output = chromium_linker_test_manifest
@@ skipping 65 matching lines @@
   testonly = true
   deps = [
     ":content_shell_java",
     "//base:base_java",
     "//content/public/android:content_java",
     "//testing/android/native_test:native_test_java",
     "//ui/android:ui_java",
   ]
   java_files = [ "browsertests/src/org/chromium/content_shell/browsertests/ContentShellBrowserTestActivity.java" ]
 }