Implement tab indicator for WebUSB.

chrome/browser/ui/tabs/tab_utils.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_TABS_TAB_UTILS_H_
 #define CHROME_BROWSER_UI_TABS_TAB_UTILS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 15 matching lines @@
 
 // Alert state for a tab.  In reality, more than one of these may apply.  See
 // comments for GetTabAlertStateForContents() below.
 enum class TabAlertState {
   NONE,
   MEDIA_RECORDING,      // Audio/Video being recorded, consumed by tab.
   TAB_CAPTURING,        // Tab contents being captured.
   AUDIO_PLAYING,        // Audible audio is playing from the tab.
   AUDIO_MUTING,         // Tab audio is being muted.
   BLUETOOTH_CONNECTED,  // Tab is connected to a BT Device.
+  USB_CONNECTED,        // Tab is connected to a USB device.
 };
 
 enum class TabMutedReason {
   NONE,             // The tab has never been muted or unmuted.
   CONTEXT_MENU,     // Mute/Unmute chosen from tab context menu.
   AUDIO_INDICATOR,  // Mute toggled via tab-strip audio icon.
   MEDIA_CAPTURE,    // Media recording/capture was started.
   EXTENSION,        // Mute state changed via extension API.
 };
 
@@ skipping 94 matching lines @@
 // string is returned.
 const std::string& GetExtensionIdForMutedTab(content::WebContents* contents);
 
 // Returns true if the tabs at the |indices| in |tab_strip| are all muted.
 bool AreAllTabsMuted(const TabStripModel& tab_strip,
                      const std::vector<int>& indices);
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_UTILS_H_