Add feature flag for mic gain settings in system tray

Bug: 1065079
Change-Id: I0646096217a8cdef1715061cb0b60f440c4a6240
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2122862Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753793}

ash/public/cpp/ash_features.cc

@@ -116,6 +116,9 @@ const base::Feature kDragFromShelfToHomeOrOverview{
 const base::Feature kHideShelfControlsInTabletMode{
     "HideShelfControlsInTabletMode", base::FEATURE_ENABLED_BY_DEFAULT};
 
+const base::Feature kSystemTrayMicGainSetting{
+    "SystemTrayMicGainSetting", base::FEATURE_DISABLED_BY_DEFAULT};
+
 bool IsAllowAmbientEQEnabled() {
   return base::FeatureList::IsEnabled(kAllowAmbientEQ);
 }
@@ -245,6 +248,10 @@ bool IsCornerShortcutsEnabled() {
   return base::FeatureList::IsEnabled(kCornerShortcuts);
 }
 
+bool IsSystemTrayMicGainSettingEnabled() {
+  return base::FeatureList::IsEnabled(kSystemTrayMicGainSetting);
+}
+
 namespace {
 
 // The boolean flag indicating if "WebUITabStrip" feature is enabled in Chrome.

ash/public/cpp/ash_features.h

@@ -150,6 +150,10 @@ ASH_PUBLIC_EXPORT extern const base::Feature kDragFromShelfToHomeOrOverview;
 // preferences, or policy).
 ASH_PUBLIC_EXPORT extern const base::Feature kHideShelfControlsInTabletMode;
 
+// Enables sliders for setting mic gain levels in the more audio settings
+// section in the system tray.
+ASH_PUBLIC_EXPORT extern const base::Feature kSystemTrayMicGainSetting;
+
 ASH_PUBLIC_EXPORT bool IsAllowAmbientEQEnabled();
 
 ASH_PUBLIC_EXPORT bool IsAltTabLimitedToActiveDesk();
@@ -204,6 +208,8 @@ ASH_PUBLIC_EXPORT bool AreContextualNudgesEnabled();
 
 ASH_PUBLIC_EXPORT bool IsCornerShortcutsEnabled();
 
+ASH_PUBLIC_EXPORT bool IsSystemTrayMicGainSettingEnabled();
+
 // These two functions are supposed to be temporary functions to set or get
 // whether "WebUITabStrip" feature is enabled from Chrome.
 ASH_PUBLIC_EXPORT void SetWebUITabStripEnabled(bool enabled);