Reland "[ios] add credit card test for manual fallback"

This is a reland of 30e1dd18

Adding feature flags to slimnav.
Revert bug: https://bugs.chromium.org/p/chromium/issues/detail?id=908970

Original change's description:
> [ios] add credit card test for manual fallback
>
> Also adds AutofillManualFallbackPhaseTwo to test bots.
>
> Bug: 845472
> Change-Id: I6bd05781c09c24c0768e24acfe59efa7ce1da05d
> Reviewed-on: https://chromium-review.googlesource.com/c/1337347
> Reviewed-by: Rohit Rao <rohitrao@chromium.org>
> Reviewed-by: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
> Commit-Queue: David Jean <djean@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#611171}

TBR=rohitrao@chromium.org

Bug: 845472,908970
Change-Id: I2cc0cddf0be8cea447f45f69457afbe19c840f29
Reviewed-on: https://chromium-review.googlesource.com/c/1352328
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611679}

ios/build/bots/chromium.mac/ios-slimnav.json

@@ -159,7 +159,7 @@
     {
       "app": "ios_chrome_manual_fill_egtests",
       "test args": [
-        "--enable-features=AutofillManualFallback,WebFrameMessaging,SlimNavigationManager"
+        "--enable-features=AutofillManualFallback,AutofillManualFallbackPhaseTwo,WebFrameMessaging,SlimNavigationManager"
       ],
       "device type": "iPad Air 2",
       "os": "11.4",
@@ -250,7 +250,7 @@
     {
       "app": "ios_chrome_manual_fill_egtests",
       "test args": [
-        "--enable-features=AutofillManualFallback,WebFrameMessaging,SlimNavigationManager"
+        "--enable-features=AutofillManualFallback,AutofillManualFallbackPhaseTwo,WebFrameMessaging,SlimNavigationManager"
       ],
       "xctest": true,
       "device type": "iPad Air 2",
@@ -342,7 +342,7 @@
     {
       "app": "ios_chrome_manual_fill_egtests",
       "test args": [
-        "--enable-features=AutofillManualFallback,WebFrameMessaging,SlimNavigationManager"
+        "--enable-features=AutofillManualFallback,AutofillManualFallbackPhaseTwo,WebFrameMessaging,SlimNavigationManager"
       ],
       "xctest": true,
       "device type": "iPhone X",
@@ -433,7 +433,7 @@
     {
       "app": "ios_chrome_manual_fill_egtests",
       "test args": [
-        "--enable-features=AutofillManualFallback,WebFrameMessaging,SlimNavigationManager"
+        "--enable-features=AutofillManualFallback,AutofillManualFallbackPhaseTwo,WebFrameMessaging,SlimNavigationManager"
       ],
       "device type": "iPhone X",
       "os": "12.1",

ios/build/bots/tests/eg_tests.json

@@ -11,7 +11,7 @@
     {
       "app": "ios_chrome_manual_fill_egtests",
       "test args": [
-        "--enable-features=AutofillManualFallback,WebFrameMessaging"
+        "--enable-features=AutofillManualFallback,AutofillManualFallbackPhaseTwo,WebFrameMessaging"
       ],
       "xctest": true
     },

ios/chrome/browser/ui/autofill/manual_fill/BUILD.gn

@@ -184,6 +184,7 @@ source_set("eg_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
+    "card_view_controller_egtest.mm",
     "keyboard_observer_egtest.mm",
     "password_view_controller_egtest.mm",
   ]
@@ -192,10 +193,13 @@ source_set("eg_tests") {
     ":manual_fill_ui",
     "//base",
     "//base/test:test_support",
+    "//components/autofill/core/browser",
+    "//components/autofill/core/browser:test_support",
     "//components/autofill/core/common",
     "//components/autofill/ios/browser",
     "//components/keyed_service/core",
     "//components/password_manager/core/browser",
+    "//ios/chrome/browser/autofill",
     "//ios/chrome/browser/passwords",
     "//ios/chrome/browser/ui/util",
     "//ios/chrome/test/app:test_support",

ios/chrome/browser/ui/autofill/manual_fill/card_mediator.h

@@ -20,7 +20,6 @@ class CreditCard;
 
 namespace manual_fill {
 extern NSString* const ManageCardsAccessibilityIdentifier;
-extern NSString* const OtherCardsAccessibilityIdentifier;
 }  // namespace manual_fill
 
 // Object in charge of getting the cards relevant for the manual fill

testing/buildbot/gn_isolate_map.pyl

@@ -703,7 +703,7 @@
     "label": "//ios/chrome/test/earl_grey:ios_chrome_manual_fill_egtests",
     "type": "raw",
     "args": [
-      "--enable-features=AutofillManualFallback,WebFrameMessaging",
+      "--enable-features=AutofillManualFallback,AutofillManualFallbackPhaseTwo,WebFrameMessaging",
     ],
   },
   "ios_chrome_reading_list_egtests": {