Creating new gn arg: enable_all_proguard_optimizations.

components/cronet/android/BUILD.gn

Index: components/cronet/android/BUILD.gn
diff --git a/components/cronet/android/BUILD.gn b/components/cronet/android/BUILD.gn
index ec59f29b533bb89e8003bd485fd092ab07ab7ac5..ae93970be36cbf1b57e97dd6796a516df9331776 100644
--- a/components/cronet/android/BUILD.gn
+++ b/components/cronet/android/BUILD.gn
@@ -377,28 +377,30 @@ android_resources("cronet_sample_test_apk_resources") {
   android_manifest = "sample/AndroidManifest.xml"
 }
 
-instrumentation_test_apk("cronet_sample_test_apk") {
-  apk_name = "CronetSampleTest"
-  apk_under_test = ":cronet_sample_apk"
-  android_manifest = "sample/javatests/AndroidManifest.xml"
-  java_files = [
-    "sample/javatests/src/org/chromium/cronet_sample_apk/Criteria.java",
-    "sample/javatests/src/org/chromium/cronet_sample_apk/CronetSampleTest.java",
-  ]
+if (!enable_all_proguard_optimizations) {
+  instrumentation_test_apk("cronet_sample_test_apk") {
+    apk_name = "CronetSampleTest"
+    apk_under_test = ":cronet_sample_apk"
+    android_manifest = "sample/javatests/AndroidManifest.xml"
+    java_files = [
+      "sample/javatests/src/org/chromium/cronet_sample_apk/Criteria.java",
+      "sample/javatests/src/org/chromium/cronet_sample_apk/CronetSampleTest.java",
+    ]
 
-  deps = [
-    ":cronet_api",
-    ":cronet_java",
-    ":cronet_sample_apk_java",
-    ":cronet_sample_test_apk_resources",
-    "//base:base_java",
-    "//base:base_java_test_support",
-    "//net/android:net_java_test_support",
-  ]
-  additional_apks = [ "//net/android:net_test_support_apk" ]
+    deps = [
+      ":cronet_api",
+      ":cronet_java",
+      ":cronet_sample_apk_java",
+      ":cronet_sample_test_apk_resources",
+      "//base:base_java",
+      "//base:base_java_test_support",
+      "//net/android:net_java_test_support",
+    ]
+    additional_apks = [ "//net/android:net_test_support_apk" ]
 
-  run_findbugs_override = true
-  proguard_enabled = !is_java_debug
+    run_findbugs_override = true
+    proguard_enabled = !is_java_debug
+  }
 }
 
 generate_jni("cronet_tests_jni_headers") {