Adds UMA histograms for desktop tab and audio capture through

content/browser/renderer_host/media/video_capture_manager.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 "content/browser/renderer_host/media/video_capture_manager.h"
 
 #include <algorithm>
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/task_runner_util.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "build/build_config.h"
+#include "content/browser/media/capture/desktop_capture_device_uma_types.h"
 #include "content/browser/media/capture/web_contents_video_capture_device.h"
 #include "content/browser/media/media_internals.h"
 #include "content/browser/renderer_host/media/video_capture_controller.h"
 #include "content/browser/renderer_host/media/video_capture_controller_event_handler.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/desktop_media_id.h"
 #include "content/public/common/media_stream_request.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/media_switches.h"
 #include "media/capture/video/video_capture_device.h"
@@ skipping 483 matching lines @@
   scoped_ptr<media::VideoCaptureDevice> video_capture_device;
 #if defined(ENABLE_SCREEN_CAPTURE)
   DesktopMediaID desktop_id = DesktopMediaID::Parse(id);
   if (desktop_id.is_null()) {
     device_client->OnError(FROM_HERE, "Desktop media ID is null");
     return nullptr;
   }
 
   if (desktop_id.type == DesktopMediaID::TYPE_WEB_CONTENTS) {
     video_capture_device.reset(WebContentsVideoCaptureDevice::Create(id));
+    IncrementDesktopCaptureCounter(TAB_VIDEO_CAPTURER_CREATED);
   } else {
 #if defined(USE_AURA)
     video_capture_device = DesktopCaptureDeviceAura::Create(desktop_id);
 #endif
     if (!video_capture_device)
       video_capture_device = DesktopCaptureDevice::Create(desktop_id);
   }
 #endif  // defined(ENABLE_SCREEN_CAPTURE)
 
   if (!video_capture_device) {
@@ skipping 438 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   BrowserThread::PostTaskAndReply(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&AVFoundationGlue::InitializeAVFoundation),
       base::Bind(&VideoCaptureManager::OnDeviceLayerInitialized, this,
                  and_then));
 }
 #endif
 
 }  // namespace content