[Media] Add a Finch experiment to enable the permission bubble request.

chrome/browser/media/media_capture_devices_dispatcher.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/media/media_capture_devices_dispatcher.h"
 
 #include "apps/app_window.h"
 #include "apps/app_window_registry.h"
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/metrics/field_trial.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/sha1.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/extensions/api/tab_capture/tab_capture_registry.h"
 #include "chrome/browser/media/desktop_streams_registry.h"
 #include "chrome/browser/media/media_stream_capture_indicator.h"
 #include "chrome/browser/media/media_stream_infobar_delegate.h"
@@ skipping 36 matching lines @@
 #define AUDIO_STREAM_MONITORING
 #include "chrome/browser/media/audio_stream_monitor.h"
 #endif  // !defined(OS_ANDROID) && !defined(OS_IOS)
 
 using content::BrowserThread;
 using content::MediaCaptureDevices;
 using content::MediaStreamDevices;
 
 namespace {
 
+// A finch experiment to enable the permission bubble for media requests only.
+bool MediaStreamPermissionBubbleExperimentEnabled() {
+  const std::string group =
+      base::FieldTrialList::FindFullName("MediaStreamPermissionBubble");
+  if (group == "enabled")
+    return true;
+
+  return false;
+}
+
 // Finds a device in |devices| that has |device_id|, or NULL if not found.
 const content::MediaStreamDevice* FindDeviceWithId(
     const content::MediaStreamDevices& devices,
     const std::string& device_id) {
   content::MediaStreamDevices::const_iterator iter = devices.begin();
   for (; iter != devices.end(); ++iter) {
     if (iter->id == device_id) {
       return &(*iter);
     }
   }
@@ skipping 539 matching lines @@
   std::map<content::WebContents*, RequestsQueue>::iterator it =
       pending_requests_.find(web_contents);
 
   if (it == pending_requests_.end() || it->second.empty()) {
     // Don't do anything if the tab was closed.
     return;
   }
 
   DCHECK(!it->second.empty());
 
-  if (PermissionBubbleManager::Enabled()) {
+  if (PermissionBubbleManager::Enabled() ||
+      MediaStreamPermissionBubbleExperimentEnabled()) {
     scoped_ptr<MediaStreamDevicesController> controller(
         new MediaStreamDevicesController(web_contents,
             it->second.front().request,
             base::Bind(&MediaCaptureDevicesDispatcher::OnAccessRequestResponse,
                        base::Unretained(this), web_contents)));
     if (controller->DismissInfoBarAndTakeActionOnSettings())
       return;
     PermissionBubbleManager* bubble_manager =
         PermissionBubbleManager::FromWebContents(web_contents);
     if (bubble_manager)
@@ skipping 314 matching lines @@
 
 void MediaCaptureDevicesDispatcher::SetTestAudioCaptureDevices(
     const MediaStreamDevices& devices) {
   test_audio_devices_ = devices;
 }
 
 void MediaCaptureDevicesDispatcher::SetTestVideoCaptureDevices(
     const MediaStreamDevices& devices) {
   test_video_devices_ = devices;
 }