[ExploreSites] Create flag for new explore sites feature.

Change-Id: Ib56a9240c13723d5a4a2f3bb3a5ca16e6d1acaa6
Reviewed-on: https://chromium-review.googlesource.com/1087670
Commit-Queue: Cathy Li <chili@chromium.org>
Reviewed-by: Dmitry Titov <dimich@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564985}

chrome/browser/about_flags.cc

@@ -1294,6 +1294,9 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kContextualSearchSecondTapName,
      flag_descriptions::kContextualSearchSecondTapDescription, kOsAndroid,
      FEATURE_VALUE_TYPE(chrome::android::kContextualSearchSecondTap)},
+    {"explore-sites", flag_descriptions::kExploreSitesName,
+     flag_descriptions::kExploreSitesDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kExploreSites)},
 #endif  // OS_ANDROID
     {"show-autofill-type-predictions",
      flag_descriptions::kShowAutofillTypePredictionsName,

chrome/browser/android/chrome_feature_list.cc

@@ -95,6 +95,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &kDownloadProgressInfoBar,
     &kDownloadHomeShowStorageInfo,
     &data_reduction_proxy::features::kDataReductionMainMenu,
+    &kExploreSites,
     &kFullscreenActivity,
     &kHomePageButtonForceEnabled,
     &kHorizontalTabSwitcherAndroid,
@@ -256,6 +257,9 @@ const base::Feature kDownloadProgressInfoBar{"DownloadProgressInfoBar",
 const base::Feature kDownloadHomeShowStorageInfo{
     "DownloadHomeShowStorageInfo", base::FEATURE_DISABLED_BY_DEFAULT};
 
+const base::Feature kExploreSites{"ExploreSites",
+                                  base::FEATURE_DISABLED_BY_DEFAULT};
+
 const base::Feature kFullscreenActivity{"FullscreenActivity",
                                         base::FEATURE_DISABLED_BY_DEFAULT};
 

chrome/browser/android/chrome_feature_list.h

@@ -41,6 +41,7 @@ extern const base::Feature kDontPrefetchLibraries;
 extern const base::Feature kDownloadAutoResumptionThrottling;
 extern const base::Feature kDownloadProgressInfoBar;
 extern const base::Feature kDownloadHomeShowStorageInfo;
+extern const base::Feature kExploreSites;
 extern const base::Feature kFullscreenActivity;
 extern const base::Feature kHomePageButtonForceEnabled;
 extern const base::Feature kHorizontalTabSwitcherAndroid;

chrome/browser/flag_descriptions.cc

@@ -2056,6 +2056,10 @@ const char kContextualSearchSecondTapDescription[] =
     "Enables triggering on a second tap gesture even when Ranker would "
     "normally suppress that tap.";
 
+const char kExploreSitesName[] = "Explore websites";
+const char kExploreSitesDescription[] =
+    "Enables portal from new tab page to explore websites.";
+
 const char kDontPrefetchLibrariesName[] = "Don't Prefetch Libraries";
 const char kDontPrefetchLibrariesDescription[] =
     "Don't prefetch libraries after loading.";

chrome/browser/flag_descriptions.h

@@ -1250,6 +1250,9 @@ extern const char kContextualSearchRankerQueryDescription[];
 extern const char kContextualSearchSecondTapName[];
 extern const char kContextualSearchSecondTapDescription[];
 
+extern const char kExploreSitesName[];
+extern const char kExploreSitesDescription[];
+
 extern const char kDontPrefetchLibrariesName[];
 extern const char kDontPrefetchLibrariesDescription[];
 

tools/metrics/histograms/enums.xml

@@ -27407,6 +27407,7 @@ from previous Chrome versions.
   <int value="-650504533" label="enable-speculative-launch-service-worker"/>
   <int value="-650176557" label="OfflinePagesSvelteConcurrentLoading:enabled"/>
   <int value="-649956990" label="enable-harfbuzz-rendertext"/>
+  <int value="-648925189" label="ExploreSites:enabled"/>
   <int value="-645455405" label="MacViewsNativeDialogs:enabled"/>
   <int value="-641719457" label="disable-compositor-touch-hit-testing"/>
   <int value="-639026783" label="disable-gpu-appcontainer"/>
@@ -27956,6 +27957,7 @@ from previous Chrome versions.
   <int value="634789085" label="LayeredAPI:disabled"/>
   <int value="635076832" label="MarkHttpAs:disabled"/>
   <int value="635971109" label="PrintPdfAsImage:disabled"/>
+  <int value="636341169" label="ExploreSites:disabled"/>
   <int value="636425179" label="mhtml-generator-option"/>
   <int value="637396292" label="AllBookmarks:enabled"/>
   <int value="637452937" label="ChromeHomeSurvey:enabled"/>