Reland "Enable -Wunreachable-code in iOS builds (except for internal builds)."

This is a reland of a7b569e6

Original change's description:
> Enable -Wunreachable-code in iOS builds (except for internal builds).
> 
> This requires replacing EARL_GREY_TEST_DISABLED with DISABLED_ prefixes
> in cases where the call to EARL_GREY_TEST_DISABLED is unconditional.
> earl_grey/disabled_test_macros.h, which defines EARL_GREY_TEST_DISABLED,
> says:
> 
>     This macro should be used when the configuration for which the
>     test should be disabled can only be determined at runtime.
>     Disabling at compile-time is always preferred.
> 
> So this matches the official guidance, and there are many
> egtests that use DISABLED_ already.
> 
> Bug: 346399
> Change-Id: Ibe51463ec0e6afbd1b3bef629406163118efa64c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2125878
> Auto-Submit: Nico Weber <thakis@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
> Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#754468}

Bug: 346399
Change-Id: I5c149da6a3a0b9e49caa3e3084015df8c4bb7ac3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2127429
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754535}

base/test/test_support_ios.mm

@@ -110,8 +110,9 @@ static char** g_argv;
   // test result parser analyzes console output.
   return !base::ShouldRunIOSUnittestsWithXCTest() &&
          !base::debug::BeingDebugged();
-#endif  // TARGET_IPHONE_SIMULATOR
+#else
   return NO;
+#endif  // TARGET_IPHONE_SIMULATOR
 }
 
 // Returns the path to the directory to store gtest output files.

build/config/compiler/BUILD.gn

@@ -1591,7 +1591,8 @@ config("chromium_code") {
 
     # TODO(thakis): Enable this more often, https://crbug.com/346399
     # use_libfuzzer: https://crbug.com/1063180
-    if (!is_nacl && !use_libfuzzer && target_os != "ios") {
+    if (!is_nacl && !use_libfuzzer &&
+        !(is_ios && ios_app_bundle_id_prefix != "org.chromium")) {
       cflags += [ "-Wunreachable-code" ]
     }
 

components/safe_browsing/core/db/v4_get_hash_protocol_manager.cc

@@ -304,9 +304,7 @@ void V4GetHashProtocolManager::GetFullHashes(
   // TODO(crbug.com/1028755): Enable full hash checks on iOS.
 #if defined(OS_IOS)
   std::move(callback).Run(cached_full_hash_infos);
-  return;
-#endif
-
+#else
   net::NetworkTrafficAnnotationTag traffic_annotation =
       net::DefineNetworkTrafficAnnotation("safe_browsing_v4_get_hash", R"(
         semantics {
@@ -361,6 +359,7 @@ void V4GetHashProtocolManager::GetFullHashes(
       clock_->Now()));
   UMA_HISTOGRAM_COUNTS_100("SafeBrowsing.V4GetHash.CountOfPrefixes",
                            prefixes_to_request.size());
+#endif
 }
 
 void V4GetHashProtocolManager::GetFullHashesWithApis(

ios/chrome/browser/metrics/ukm_egtest.mm

@@ -200,12 +200,13 @@ void SignOut() {
 // //chrome/browser/metrics/ukm_browsertest.cc
 
 // Make sure that UKM is disabled while an incognito tab is open.
-- (void)testRegularPlusIncognito {
 #if defined(CHROME_EARL_GREY_1)
-  // TODO(crbug.com/1033726): EG1 Test fails on iOS 12.
-  EARL_GREY_TEST_DISABLED(@"EG1 Fails");
+// TODO(crbug.com/1033726): EG1 Test fails on iOS 12.
+#define MAYBE_testRegularPlusIncognito DISABLED_testRegularPlusIncognito
+#else
+#define MAYBE_testRegularPlusIncognito testRegularPlusIncognito
 #endif
-
+- (void)MAYBE_testRegularPlusIncognito {
   uint64_t originalClientID = [MetricsAppInterface UKMClientID];
 
   OpenNewIncognitoTab();
@@ -235,12 +236,13 @@ void SignOut() {
 }
 
 // Make sure opening a real tab after Incognito doesn't enable UKM.
-- (void)testIncognitoPlusRegular {
 #if defined(CHROME_EARL_GREY_1)
-  // TODO(crbug.com/1033726): EG1 Test fails on iOS 12.
-  EARL_GREY_TEST_DISABLED(@"EG1 Fails");
+// TODO(crbug.com/1033726): EG1 Test fails on iOS 12.
+#define MAYBE_testIncognitoPlusRegular DISABLED_testIncognitoPlusRegular
+#else
+#define MAYBE_testIncognitoPlusRegular testIncognitoPlusRegular
 #endif
-
+- (void)MAYBE_testIncognitoPlusRegular {
   uint64_t originalClientID = [MetricsAppInterface UKMClientID];
   [ChromeEarlGrey closeAllTabs];
   [ChromeEarlGrey waitForMainTabCount:0];

ios/chrome/browser/translate/translate_egtest.mm

@@ -1207,10 +1207,8 @@ void TestResponseProvider::GetLanguageResponse(
 
 // Tests that "Never Translate ..." is automatically triggered only for a
 // maximum number of times if refused by the user.
-- (void)testInfobarAutoNeverTranslateMaxTries {
-  // TODO(crbug.com/945118): Re-enable when fixed.
-  EARL_GREY_TEST_DISABLED(@"Test disabled.");
-
+// TODO(crbug.com/945118): Re-enable when fixed.
+- (void)DISABLED_testInfobarAutoNeverTranslateMaxTries {
   // Start the HTTP server.
   std::unique_ptr<web::DataResponseProvider> provider(new TestResponseProvider);
   web::test::SetUpHttpServer(std::move(provider));

ios/chrome/browser/ui/bookmarks/bookmarks_egtest.mm

@@ -240,17 +240,18 @@ using chrome_test_util::TappableBookmarkNodeWithLabel;
 }
 
 // Test that swiping left to right navigate back.
-- (void)testNavigateBackWithGesture {
-  // Disabled on iPad as there is not "navigate back" gesture.
-  if ([ChromeEarlGrey isIPadIdiom]) {
-    EARL_GREY_TEST_SKIPPED(@"Test not applicable for iPad");
-  }
-
 // TODO(crbug.com/768339): This test is faling on devices because
 // grey_swipeFastInDirectionWithStartPoint does not work.
 #if !TARGET_IPHONE_SIMULATOR
-  EARL_GREY_TEST_DISABLED(@"Test disabled on devices.");
+#define MAYBE_testNavigateBackWithGesture DISABLED_testNavigateBackWithGesture
+#else
+#define MAYBE_testNavigateBackWithGesture testNavigateBackWithGesture
 #endif
+- (void)MAYBE_testNavigateBackWithGesture {
+  // Disabled on iPad as there is not "navigate back" gesture.
+  if ([ChromeEarlGrey isIPadIdiom]) {
+    EARL_GREY_TEST_SKIPPED(@"Test not applicable for iPad");
+  }
 
   if (@available(iOS 13, *)) {
     // Navigate back side swipe gesture does not work on iOS13 simulator. This

ios/chrome/browser/ui/dialogs/javascript_dialog_egtest.mm

@@ -532,11 +532,9 @@ void TapSuppressDialogsButton() {
 }
 
 // Tests that an alert is presented after displaying the share menu.
-- (void)testShowJavaScriptAfterShareMenu {
-  // TODO(crbug.com/747622): re-enable this test once earl grey can interact
-  // with the share menu.
-  EARL_GREY_TEST_DISABLED(@"Disabled until EG can use share menu.");
-
+// TODO(crbug.com/747622): re-enable this test once earl grey can interact
+// with the share menu.
+- (void)DISABLED_testShowJavaScriptAfterShareMenu {
   // Load the blank test page.
   const GURL kURL = self.testServer->GetURL(kAlertURLPath);
   [ChromeEarlGrey loadURL:kURL];

ios/chrome/browser/ui/fullscreen/fullscreen_egtest.mm

@@ -116,11 +116,14 @@ void AssertURLIs(const GURL& expectedURL) {
 
 // Verifies that the toolbar is not hidden when scrolling a short pdf, as the
 // entire document is visible without hiding the toolbar.
-- (void)testSmallWidePDFScroll {
-// TODO(crbug.com/1022029): Enable this test.
 #if defined(CHROME_EARL_GREY_2)
-  EARL_GREY_TEST_DISABLED(@"Fails with EG2");
-#elif defined(CHROME_EARL_GREY_1)
+// TODO(crbug.com/1022029): Enable this test.
+#define MAYBE_testSmallWidePDFScroll DISABLED_testSmallWidePDFScroll
+#else
+#define MAYBE_testSmallWidePDFScroll testSmallWidePDFScroll
+#endif
+- (void)MAYBE_testSmallWidePDFScroll {
+#if defined(CHROME_EARL_GREY_1)
   // TODO(crbug.com/1036221): EG1 Test fails on iOS 12.
   if (!base::ios::IsRunningOnIOS13OrLater()) {
     EARL_GREY_TEST_DISABLED(@"EG1 Fails on iOS 12.");
@@ -153,12 +156,13 @@ void AssertURLIs(const GURL& expectedURL) {
 
 // Verifies that the toolbar properly appears/disappears when scrolling up/down
 // on a PDF that is long in length and wide in width.
-- (void)testLongPDFScroll {
-// TODO(crbug.com/714329): Re-enable this test on devices.
 #if !TARGET_IPHONE_SIMULATOR
-  EARL_GREY_TEST_DISABLED(@"Test disabled on device.");
+// TODO(crbug.com/714329): Re-enable this test on devices.
+#define MAYBE_testLongPDFScroll DISABLED_testLongPDFScroll
+#else
+#define MAYBE_testLongPDFScroll testLongPDFScroll
 #endif
-
+- (void)MAYBE_testLongPDFScroll {
   web::test::SetUpFileBasedHttpServer();
   GURL URL = web::test::HttpServer::MakeUrl(
       "http://ios/testing/data/http_server_files/two_pages.pdf");

ios/chrome/browser/ui/omnibox/omnibox_egtest.mm

@@ -150,10 +150,13 @@ id<GREYMatcher> SearchCopiedTextButton() {
 
 // Tests that the XClientData header is sent when navigating to
 // https://google.com through the omnibox.
-- (void)testXClientData {
 #if defined(CHROME_EARL_GREY_1)
-  EARL_GREY_TEST_DISABLED(@"Flaky on EG1.");
+//  Flaky on EG1.
+#define MAYBE_testXClientData DISABLED_testXClientData
+#else
+#define MAYBE_testXClientData testXClientData
 #endif
+- (void)MAYBE_testXClientData {
   // Rewrite the google URL to localhost URL.
   [OmniboxAppInterface rewriteGoogleURLToLocalhost];
 

ios/chrome/browser/ui/settings/google_services/accounts_table_egtest.mm

@@ -258,11 +258,14 @@ id<GREYMatcher> NoBookmarksLabel() {
 
 // Tests that the user isn't signed out and the UI is correct when the
 // disconnect is cancelled in the Account Settings screen.
-- (void)testSignInDisconnectCancelled {
-// TODO(crbug.com/669613): Re-enable this test on devices.
 #if !TARGET_IPHONE_SIMULATOR
-  EARL_GREY_TEST_DISABLED(@"Test disabled on device.");
+// TODO(crbug.com/669613): Re-enable this test on devices.
+#define MAYBE_testSignInDisconnectCancelled \
+  DISABLED_testSignInDisconnectCancelled
+#else
+#define MAYBE_testSignInDisconnectCancelled testSignInDisconnectCancelled
 #endif
+- (void)MAYBE_testSignInDisconnectCancelled {
   FakeChromeIdentity* fakeIdentity = [SigninEarlGreyUtils fakeIdentity1];
 
   // Sign In |fakeIdentity|, then open the Account Settings.

ios/chrome/browser/ui/toolbar/toolbar_egtest.mm

@@ -133,16 +133,14 @@ using chrome_test_util::SystemSelectionCalloutCopyButton;
 // Tests whether input mode in an omnibox can be canceled via tapping the typing
 // shield and asserts it doesn't commit the omnibox contents if the input is
 // canceled.
-- (void)testToolbarOmniboxTypingShield {
+// TODO(crbug.com/753098): Re-enable this test on iPad once grey_typeText
+// works on iOS 11.
+- (void)DISABLED_testToolbarOmniboxTypingShield {
   // Tablet only (handset keyboard does not have "hide keyboard" button).
   if (![ChromeEarlGrey isIPadIdiom]) {
     EARL_GREY_TEST_SKIPPED(@"Test not support on iPhone");
   }
 
-  // TODO(crbug.com/753098): Re-enable this test on iPad once grey_typeText
-  // works on iOS 11.
-  EARL_GREY_TEST_DISABLED(@"Test disabled on iPad.");
-
   const GURL URL = web::test::HttpServer::MakeUrl("http://origin");
 
   [ChromeEarlGrey loadURL:URL];
@@ -203,11 +201,9 @@ using chrome_test_util::SystemSelectionCalloutCopyButton;
 }
 
 // Verifies that copying and pasting a URL includes the hidden protocol prefix.
-- (void)testCopyPasteURL {
-  // TODO(crbug.com/834345): Enable this test when long press on the steady
-  // location bar is supported.
-  EARL_GREY_TEST_SKIPPED(@"Test not supported yet in UI Refresh.");
-
+// TODO(crbug.com/834345): Enable this test when long press on the steady
+// location bar is supported.
+- (void)DISABLED_testCopyPasteURL {
   // Clear generalPasteboard before and after the test.
   [UIPasteboard generalPasteboard].string = @"";
   [self setTearDownHandler:^{

ios/web_view/internal/web_view_global_state_util.mm

@@ -18,13 +18,11 @@
 namespace ios_web_view {
 
 void InitializeGlobalState() {
-#if defined(UNIT_TEST)
   // Do not perform global state initialization in an unit test environment.
   // 1. Not needed when unit testing.
   // 2. The globals below will try to create other already created globals like
   //    AtExitManagers. This causes DCHECKs and prevents tests from completing.
-  return;
-#endif  // defined(UNIT_TEST)
+#if !defined(UNIT_TEST)
   static std::unique_ptr<ios_web_view::WebViewWebClient> web_client;
   static std::unique_ptr<ios_web_view::WebViewWebMainDelegate>
       web_main_delegate;
@@ -51,6 +49,7 @@ void InitializeGlobalState() {
                   web_client.reset();
                 }];
   });
+#endif  // defined(UNIT_TEST)
 }
 
 }  // namespace ios_web_view