Adds TranslateAppInterface to prepare for EG2 conversion

Use TranslateAppInterface to migrate EG1 tests to be EG2 compatible

Bug: None
Change-Id: Ide249041d5e35567f184df89b430a3c29f1e5bc7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967763
Commit-Queue: Peter Lee <pkl@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726715}

ios/chrome/browser/translate/BUILD.gn

@@ -108,12 +108,14 @@ source_set("unit_tests") {
 }
 
 source_set("eg_tests") {
+  defines = [ "CHROME_EARL_GREY_1" ]
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "translate_egtest.mm",
   ]
   deps = [
+    ":test_support",
     ":translate",
     "//base",
     "//base/test:test_support",
@@ -132,6 +134,7 @@ source_set("eg_tests") {
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/chrome/test/fakes",
+    "//ios/testing/earl_grey:earl_grey_support",
     "//ios/third_party/earl_grey:earl_grey+link",
     "//ios/web:earl_grey_test_support",
     "//ios/web/public/test",
@@ -141,3 +144,57 @@ source_set("eg_tests") {
   ]
   libs = [ "XCTest.framework" ]
 }
+
+source_set("eg2_tests") {
+  defines = [ "CHROME_EARL_GREY_2" ]
+  configs += [
+    "//build/config/compiler:enable_arc",
+    "//build/config/ios:xctest_config",
+  ]
+  testonly = true
+  sources = []
+  deps = []
+  libs = [ "UIKit.framework" ]
+}
+
+source_set("test_support") {
+  defines = [ "CHROME_EARL_GREY_1" ]
+  testonly = true
+  sources = [
+    "translate_app_interface.h",
+    "translate_app_interface.mm",
+  ]
+  deps = [
+    "//components/translate/core/browser:browser",
+    "//components/translate/core/common:common",
+    "//components/translate/ios/browser:browser",
+    "//ios/chrome/browser/browser_state:browser_state",
+    "//ios/chrome/browser/translate",
+    "//ios/chrome/test/app:test_support",
+    "//ios/chrome/test/fakes:fakes",
+  ]
+  configs += [ "//build/config/compiler:enable_arc" ]
+}
+
+source_set("eg_app_support+eg2") {
+  defines = [ "CHROME_EARL_GREY_2" ]
+  configs += [
+    "//build/config/compiler:enable_arc",
+    "//build/config/ios:xctest_config",
+  ]
+  testonly = true
+  sources = []
+}
+
+source_set("eg_test_support+eg2") {
+  defines = [ "CHROME_EARL_GREY_2" ]
+  configs += [
+    "//build/config/compiler:enable_arc",
+    "//build/config/ios:xctest_config",
+  ]
+  testonly = true
+  sources = []
+  deps = [
+    "//ios/testing/earl_grey:eg_test_support+eg2",
+  ]
+}

ios/chrome/browser/translate/translate_app_interface.h

+// Copyright 2019 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.
+
+#ifndef IOS_CHROME_BROWSER_TRANSLATE_TRANSLATE_APP_INTERFACE_H_
+#define IOS_CHROME_BROWSER_TRANSLATE_TRANSLATE_APP_INTERFACE_H_
+
+#import <Foundation/Foundation.h>
+
+@interface TranslateAppInterface : NSObject
+
+// Sets up the app for testing.
++ (void)setUp;
+
+// Tears down the testing set up for the app.
++ (void)tearDown;
+
+// Registers an observer of the IOSLanguageDetectionTabHelper to capture
+// the details of webpage language detection. The captured details can be
+// used for test verification.
++ (void)setUpLanguageDetectionTabHelperObserver;
+
+// Deallocates the observer for IOSLanguageDetectionTabHelper.
++ (void)tearDownLanguageDetectionTabHelperObserver;
+
+// Resets the language detection state kept in the observer of
+// IOSLanguageDetectionTabHelper.
++ (void)resetLanguageDetectionTabHelperObserver;
+
+// Returns whether a language information was detected on the webpage.
++ (BOOL)isLanguageDetected;
+
+// Returns the language code of the webpage indicated in the Content-Language
+// HTTP header.
++ (NSString*)contentLanguage;
+
+// Returns the language code indicated in the language attribute of the HTML
+// element.
++ (NSString*)htmlRootLanguage;
+
+// Returns the language code for the language determined from the webpage.
++ (NSString*)adoptedLanguage;
+
+// Sets up a fake translation manager for the current WebState. This translation
+// manager fakes the translation and does not depend on the real JavaScript.
++ (void)setUpFakeJSTranslateManagerInCurrentTab;
+
+/// Whether user has set a preference to translate from |source| language to
+// |target| language.
++ (BOOL)shouldAutoTranslateFromLanguage:(NSString*)source
+                             toLanguage:(NSString*)target;
+
+// Whether user has set a preference to block the translation of |language|.
++ (BOOL)isBlockedLanguage:(NSString*)language;
+
+// Whether user has set a preference to translate any pages on |hostName|.
++ (BOOL)isBlockedSite:(NSString*)hostName;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_TRANSLATE_TRANSLATE_APP_INTERFACE_H_

ios/chrome/browser/translate/translate_app_interface_stub.mm

+// Copyright 2019 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 "ios/chrome/browser/translate/translate_app_interface.h"
+#import "ios/testing/earl_grey/earl_grey_test.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+#if defined(CHROME_EARL_GREY_2)
+// TODO(crbug.com/1015113): The EG2 macro is breaking indexing for some reason
+// without the trailing semicolon.  For now, disable the extra semi warning
+// so Xcode indexing works for the egtest.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wc++98-compat-extra-semi"
+GREY_STUB_CLASS_IN_APP_MAIN_QUEUE(TranslateAppInterface);
+#pragma clang diagnostic pop
+#endif  // defined(CHROME_EARL_GREY_2)