[iOS][omnibox] Expose two flags in iOS about://flags.

OmniboxReportAssistedQueryStats, OmniboxReportSearchboxStats are flags
that are experimented with on iOS, so they should be available for
manual switching.

Bug: none
Change-Id: Ia1b26d02d1dc74850f727dd891551cb42a93ce0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4192144
Reviewed-by: Christian Xu <christianxu@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Auto-Submit: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/branch-heads/5481@{#620}
Cr-Branched-From: 130f3e4-refs/heads/main@{#1084008}

ios/chrome/browser/flags/about_flags.mm

@@ -790,6 +790,14 @@
      flag_descriptions::kOmniboxFocusTriggersSRPZeroSuggestDescription,
      flags_ui::kOsIos,
      FEATURE_VALUE_TYPE(omnibox::kFocusTriggersSRPZeroSuggest)},
+    {"omnibox-report-assisted-query-stats",
+     flag_descriptions::kOmniboxReportAssistedQueryStatsName,
+     flag_descriptions::kOmniboxReportAssistedQueryStatsDescription,
+     flags_ui::kOsIos, FEATURE_VALUE_TYPE(omnibox::kReportAssistedQueryStats)},
+    {"omnibox-report-searchbox-stats",
+     flag_descriptions::kOmniboxReportSearchboxStatsName,
+     flag_descriptions::kOmniboxReportSearchboxStatsDescription,
+     flags_ui::kOsIos, FEATURE_VALUE_TYPE(omnibox::kReportSearchboxStats)},
     {"omnibox-fuzzy-url-suggestions",
      flag_descriptions::kOmniboxFuzzyUrlSuggestionsName,
      flag_descriptions::kOmniboxFuzzyUrlSuggestionsDescription,

ios/chrome/browser/flags/ios_chrome_flag_descriptions.cc

@@ -601,6 +601,18 @@ const char kOmniboxLocalHistoryZeroSuggestBeyondNTPDescription[] =
     "Enables local history zero-prefix suggestions in every context in which "
     "the remote zero-prefix suggestions are enabled.";
 
+const char kOmniboxReportAssistedQueryStatsName[] =
+    "Omnibox Assisted Query Stats param";
+const char kOmniboxReportAssistedQueryStatsDescription[] =
+    "Enables reporting the Assisted Query Stats param in search destination "
+    "URLs originated from the Omnibox.";
+
+const char kOmniboxReportSearchboxStatsName[] =
+    "Omnibox Searchbox Stats proto param";
+const char kOmniboxReportSearchboxStatsDescription[] =
+    "Enables reporting the serialized Searchbox Stats proto param in search "
+    "destination URLs originated from the Omnibox.";
+
 const char kOmniboxZeroSuggestPrefetchingName[] =
     "Omnibox Zero Prefix Suggestion Prefetching on NTP";
 const char kOmniboxZeroSuggestPrefetchingDescription[] =

ios/chrome/browser/flags/ios_chrome_flag_descriptions.h

@@ -518,6 +518,14 @@ extern const char kOmniboxOnFocusSuggestionsDescription[];
 extern const char kOmniboxMaxURLMatchesName[];
 extern const char kOmniboxMaxURLMatchesDescription[];
 
+// Title and description for assisted query stats param reporting.
+extern const char kOmniboxReportAssistedQueryStatsName[];
+extern const char kOmniboxReportAssistedQueryStatsDescription[];
+
+// Title and description for searchbox stats flag.
+extern const char kOmniboxReportSearchboxStatsName[];
+extern const char kOmniboxReportSearchboxStatsDescription[];
+
 // Title and description for the flag to swap Omnibox Textfield implementation
 // to a new experimental one.
 extern const char kOmniboxNewImplementationName[];