SearchProviderLogos: Add about:flags entry for UseDdljsonApi on iOS

This is basically the iOS version of
https://chromium-review.googlesource.com/c/600309.
It'll make manual testing of the feature much easier.

Bug: 690467
Change-Id: I46656106f42821346bb323c655296e63e4ddd2b1
Reviewed-on: https://chromium-review.googlesource.com/602129Reviewed-by: Rohit Rao (ping after 24h) <rohitrao@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492020}

ios/chrome/browser/BUILD.gn

@@ -102,6 +102,7 @@ source_set("browser") {
     "//components/proxy_config/ios",
     "//components/reading_list/ios",
     "//components/search_engines",
+    "//components/search_provider_logos",
     "//components/security_state/core",
     "//components/signin/core/browser",
     "//components/ssl_config",

ios/chrome/browser/about_flags.mm

@@ -29,6 +29,7 @@
 #include "components/flags_ui/flags_ui_switches.h"
 #include "components/ntp_tiles/switches.h"
 #include "components/payments/core/features.h"
+#include "components/search_provider_logos/features.h"
 #include "components/security_state/core/switches.h"
 #include "components/signin/core/common/signin_switches.h"
 #include "components/strings/grit/components_strings.h"
@@ -66,6 +67,29 @@ const FeatureEntry::Choice kMarkHttpAsChoices[] = {
      security_state::switches::kMarkHttpAs,
      security_state::switches::kMarkHttpAsDangerous}};
 
+const FeatureEntry::FeatureParam kUseDdljsonApiTest1[] = {
+    {search_provider_logos::features::kDdljsonOverrideUrlParam,
+     "https://www.gstatic.com/chrome/ntp/doodle_test/ddljson_ios1.json"}};
+const FeatureEntry::FeatureParam kUseDdljsonApiTest2[] = {
+    {search_provider_logos::features::kDdljsonOverrideUrlParam,
+     "https://www.gstatic.com/chrome/ntp/doodle_test/ddljson_ios2.json"}};
+const FeatureEntry::FeatureParam kUseDdljsonApiTest3[] = {
+    {search_provider_logos::features::kDdljsonOverrideUrlParam,
+     "https://www.gstatic.com/chrome/ntp/doodle_test/ddljson_ios3.json"}};
+const FeatureEntry::FeatureParam kUseDdljsonApiTest4[] = {
+    {search_provider_logos::features::kDdljsonOverrideUrlParam,
+     "https://www.gstatic.com/chrome/ntp/doodle_test/ddljson_ios4.json"}};
+
+const FeatureEntry::FeatureVariation kUseDdljsonApiVariations[] = {
+    {"(force test doodle 1)", kUseDdljsonApiTest1,
+     arraysize(kUseDdljsonApiTest1), nullptr},
+    {"(force test doodle 2)", kUseDdljsonApiTest2,
+     arraysize(kUseDdljsonApiTest2), nullptr},
+    {"(force test doodle 3)", kUseDdljsonApiTest3,
+     arraysize(kUseDdljsonApiTest3), nullptr},
+    {"(force test doodle 4)", kUseDdljsonApiTest4,
+     arraysize(kUseDdljsonApiTest4), nullptr}};
+
 // To add a new entry, add to the end of kFeatureEntries. There are four
 // distinct types of entries:
 // . ENABLE_DISABLE_VALUE: entry is either enabled, disabled, or uses the
@@ -117,7 +141,13 @@ const flags_ui::FeatureEntry kFeatureEntries[] = {
      FEATURE_WITH_PARAMS_VALUE_TYPE(
          feature_engagement::kIPHDemoMode,
          feature_engagement::kIPHDemoModeChoiceVariations,
-         "IPH_DemoMode")}};
+         "IPH_DemoMode")},
+    {"use-ddljson-api", flag_descriptions::kUseDdljsonApiName,
+     flag_descriptions::kUseDdljsonApiDescription, flags_ui::kOsIos,
+     FEATURE_WITH_PARAMS_VALUE_TYPE(
+         search_provider_logos::features::kUseDdljsonApi,
+         kUseDdljsonApiVariations,
+         search_provider_logos::features::kUseDdljsonApi.name)}};
 
 // Add all switches from experimental flags to |command_line|.
 void AppendSwitchesFromExperimentalSettings(base::CommandLine* command_line) {

ios/chrome/browser/ios_chrome_flag_descriptions.cc

@@ -38,6 +38,10 @@ const char kMarkHttpAsNonSecureWhileIncognito[] =
 const char kMarkHttpAsNonSecureWhileIncognitoOrEditing[] =
     "Warn on HTTP while in Incognito mode or after editing forms";
 
+const char kUseDdljsonApiName[] = "Use new ddljson API for Doodles";
+const char kUseDdljsonApiDescription[] =
+    "Enables the new ddljson API to fetch Doodles for the NTP.";
+
 const char kWebPaymentsName[] = "Web Payments";
 
 const char kWebPaymentsDescription[] =

ios/chrome/browser/ios_chrome_flag_descriptions.h

@@ -35,6 +35,10 @@ extern const char kPhysicalWeb[];
 // Description for the flag to enable Physical Web in the omnibox.
 extern const char kPhysicalWebDescription[];
 
+// Title and description for the flag to enable the ddljson Doodle API.
+extern const char kUseDdljsonApiName[];
+extern const char kUseDdljsonApiDescription[];
+
 // Title and description for the flag to enable Web Payments.
 extern const char kWebPaymentsName[];
 extern const char kWebPaymentsDescription[];