Add about_flag for experimenting MediaSession on Desktop

chrome/browser/about_flags.cc

 // 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 596 matching lines @@
     {IDS_FLAGS_WEBRTC_HW_ENCODING_ALL, switches::kDisableWebRtcHWEncoding, ""},
     {IDS_FLAGS_WEBRTC_HW_ENCODING_VPX, switches::kDisableWebRtcHWEncoding,
      switches::kDisableWebRtcHWEncodingVPx},
     {IDS_FLAGS_WEBRTC_HW_ENCODING_H264, switches::kDisableWebRtcHWEncoding,
      switches::kDisableWebRtcHWEncodingH264},
     {IDS_FLAGS_WEBRTC_HW_ENCODING_NONE, switches::kDisableWebRtcHWEncoding,
      switches::kDisableWebRtcHWEncodingNone},
 };
 #endif  // ENABLE_WEBRTC
 
+#if !defined(OS_ANDROID)
+const FeatureEntry::Choice kEnableDefaultMediaSessionChoices[] = {
+    {IDS_FLAGS_ENABLE_DEFAULT_MEDIA_SESSION_DISABLED, "", ""},
+    {IDS_FLAGS_ENABLE_DEFAULT_MEDIA_SESSION_ENABLED,
+     switches::kEnableDefaultMediaSession, ""},
+#if defined(ENABLE_PLUGINS)
+    {IDS_FLAGS_ENABLE_DEFAULT_MEDIA_SESSION_ENABLED_WITH_FLASH,
+     switches::kEnableDefaultMediaSession,
+     switches::kEnableDefaultMediaSessionWithFlash},
+#endif  // defined(ENABLE_PLUGINS)
+};
+#endif  // !defined(OS_ANDROID)
+
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
 // The first line of the entry is the internal name.
 //
 // To add a new entry, add to the end of kFeatureEntries. There are two
 // distinct types of entries:
 // . SINGLE_VALUE: entry is either on or off. Use the SINGLE_VALUE_TYPE
 //   macro for this type supplying the command line to the macro.
 // . MULTI_VALUE: a list of choices, the first of which should correspond to a
 //   deactivated state for this lab (i.e. no command line option).  To specify
@@ skipping 1417 matching lines @@
      IDS_FLAGS_SECURITY_CHIP_DESCRIPTION, kOsDesktop,
      MULTI_VALUE_TYPE(kSecurityChipChoices)},
     {"security-chip-animation", IDS_FLAGS_SECURITY_CHIP_ANIMATION_NAME,
      IDS_FLAGS_SECURITY_CHIP_ANIMATION_DESCRIPTION, kOsDesktop,
      MULTI_VALUE_TYPE(kSecurityChipAnimationChoices)},
 #if defined(OS_CHROMEOS)
     {"enumerate-audio-devices", IDS_FLAGS_ENABLE_ENUMERATING_AUDIO_DEVICES_NAME,
      IDS_FLAGS_ENABLE_ENUMERATING_AUDIO_DEVICES_DESCRIPTION, kOsCrOS,
      FEATURE_VALUE_TYPE(features::kEnumerateAudioDevices)},
 #endif  // OS_CHROMEOS
-
+#if !defined(OS_ANDROID)
+    {"enable-default-media-session",
+     IDS_FLAGS_ENABLE_DEFAULT_MEDIA_SESSION_NAME,
+     IDS_FLAGS_ENABLE_DEFAULT_MEDIA_SESSION_DESCRIPTION, kOsDesktop,
+     MULTI_VALUE_TYPE(kEnableDefaultMediaSessionChoices)},
+#endif  // !defined(OS_ANDROID)
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.
 };
 
 class FlagsStateSingleton {
  public:
   FlagsStateSingleton()
       : flags_state_(kFeatureEntries, arraysize(kFeatureEntries)) {}
   ~FlagsStateSingleton() {}
@@ skipping 188 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags