Add support for single sample metrics.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 35 matching lines @@
 #include "base/sys_info.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/trace_event.h"
 #include "base/tracked_objects.h"
 #include "build/build_config.h"
 #include "cc/base/switches.h"
 #include "cc/output/buffer_to_texture_target_map.h"
 #include "components/discardable_memory/service/discardable_shared_memory_manager.h"
+#include "components/metrics/single_value_histograms_provider.h"
 #include "components/tracing/common/tracing_switches.h"
 #include "content/browser/appcache/appcache_dispatcher_host.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/background_fetch/background_fetch_service_impl.h"
 #include "content/browser/background_sync/background_sync_service_impl.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/blob_storage/blob_dispatcher_host.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/browser/broadcast_channel/broadcast_channel_provider.h"
 #include "content/browser/browser_child_process_host_impl.h"
@@ skipping 1223 matching lines @@
                  make_scoped_refptr(
                      storage_partition_impl_->GetBackgroundFetchContext())));
 
   registry->AddInterface(base::Bind(&RenderProcessHostImpl::CreateMusGpuRequest,
                                     base::Unretained(this)));
 
   registry->AddInterface(
       base::Bind(&VideoCaptureHost::Create,
                  BrowserMainLoop::GetInstance()->media_stream_manager()));
 
+  registry->AddInterface(
+      base::Bind(&metrics::SingleValueHistogramsProvider::Create));
+
   // This is to support usage of WebSockets in cases in which there is no
   // associated RenderFrame (e.g., Shared Workers).
   AddUIThreadInterface(
       registry.get(), base::Bind(&WebSocketManager::CreateWebSocket, GetID(),
                                  MSG_ROUTING_NONE));
 
   // Chrome browser process only provides DiscardableSharedMemory service when
   // Chrome is not running in mus+ash.
   if (!service_manager::ServiceManagerIsRemote()) {
     discardable_memory::DiscardableSharedMemoryManager* manager =
@@ skipping 1774 matching lines @@
   LOG(ERROR) << "Terminating render process for bad Mojo message: " << error;
 
   // The ReceivedBadMessage call below will trigger a DumpWithoutCrashing.
   // Capture the error message in a crash key value.
   base::debug::ScopedCrashKey error_key_value("mojo-message-error", error);
   bad_message::ReceivedBadMessage(render_process_id,
                                   bad_message::RPH_MOJO_PROCESS_ERROR);
 }
 
 }  // namespace content