Add flag for tab hover cards feature.

Bug: 910739
Change-Id: Ic708c771665e70979cf6011c482dd050ce749fe5
Reviewed-on: https://chromium-review.googlesource.com/c/1357539
Commit-Queue: Caroline Rising <corising@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613213}

chrome/browser/about_flags.cc

@@ -3584,6 +3584,10 @@ const FeatureEntry kFeatureEntries[] = {
      FEATURE_VALUE_TYPE(features::kAutoFetchOnNetErrorPage)},
 #endif  // defined(OS_ANDROID)
 
+    {"tab-hover-cards", flag_descriptions::kTabHoverCardsName,
+     flag_descriptions::kTabHoverCardsDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kTabHoverCards)},
+
     {"enable-block-tab-unders", flag_descriptions::kBlockTabUndersName,
      flag_descriptions::kBlockTabUndersDescription, kOsAll,
      FEATURE_VALUE_TYPE(TabUnderNavigationThrottle::kBlockTabUnders)},

chrome/browser/browser_features.cc

@@ -20,4 +20,8 @@ const base::Feature kWebUIDarkMode{"WebUIDarkMode",
                                    base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
+// Enables popup cards containing tab information when hovering over a tab.
+const base::Feature kTabHoverCards{"TabHoverCards",
+                                   base::FEATURE_DISABLED_BY_DEFAULT};
+
 }  // namespace features

chrome/browser/browser_features.h

@@ -24,6 +24,8 @@ extern const base::Feature kDoubleTapToZoomInTabletMode;
 extern const base::Feature kWebUIDarkMode;
 #endif
 
+extern const base::Feature kTabHoverCards;
+
 }  // namespace features
 
 #endif  // CHROME_BROWSER_BROWSER_FEATURES_H_

chrome/browser/flag-metadata.json

@@ -3096,6 +3096,11 @@
     // "owners": [ "your-team" ],
     "expiry_milestone": 76
   },
+  {
+    "name": "tab-hover-cards",
+    "owners": [ "corising", "//chrome/browser/ui/views/tabs/OWNERS" ],
+    "expiry_milestone": 76
+  },
   {
     "name": "tab-strip-keyboard-focus",
     // "owners": [ "your-team" ],

chrome/browser/flag_descriptions.cc

@@ -1866,6 +1866,11 @@ const char kSystemKeyboardLockDescription[] =
     "keyboard shortcuts and have the events routed directly to the website "
     "when in fullscreen mode.";
 
+const char kTabHoverCardsName[] = "Tab Hover Cards";
+const char kTabHoverCardsDescription[] =
+    "Enables a popup containing tab information to be visible when hovering "
+    "over a tab. This will replace tooltips for tabs.";
+
 const char kTabsInCbdName[] = "Enable tabs for the Clear Browsing Data dialog.";
 const char kTabsInCbdDescription[] =
     "Enables a basic and an advanced tab for the Clear Browsing Data dialog.";

chrome/browser/flag_descriptions.h

@@ -1125,6 +1125,9 @@ extern const char kSyncUSSAutofillWalletDataDescription[];
 extern const char kSysInternalsName[];
 extern const char kSysInternalsDescription[];
 
+extern const char kTabHoverCardsName[];
+extern const char kTabHoverCardsDescription[];
+
 extern const char kTabsInCbdName[];
 extern const char kTabsInCbdDescription[];
 

tools/metrics/histograms/enums.xml

@@ -29292,6 +29292,7 @@ from previous Chrome versions.
   <int value="-2082462043" label="ViewPasswords:disabled"/>
   <int value="-2082042818"
       label="AutofillCreditCardLastUsedDateDisplay:enabled"/>
+  <int value="-2080504230" label="TabHoverCards:disabled"/>
   <int value="-2077268643" label="disable-device-enumeration"/>
   <int value="-2075870708" label="MediaRemotingEncrypted:disabled"/>
   <int value="-2075807193" label="enable-webusb-on-any-origin"/>
@@ -31606,6 +31607,7 @@ from previous Chrome versions.
   <int value="2020107447" label="AndroidPayIntegrationV1:enabled"/>
   <int value="2032558514"
       label="RemoveUsageOfDeprecatedGaiaSigninEndpoint:enabled"/>
+  <int value="2034198538" label="TabHoverCards:enabled"/>
   <int value="2037756154" label="enable-impl-side-painting"/>
   <int value="2043321329" label="OfflinePagesPrefetchingUI:disabled"/>
   <int value="2056572020" label="EnableUsernameCorrection:disabled"/>