Add a DownloadService client needed by downstream

This client is needed by downstream (Mountain) repo.

Bug: b/75308868
Change-Id: I06829202017f8244db7787ff0cb3f09b01662032
Reviewed-on: https://chromium-review.googlesource.com/972224Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Rudy Xie <rudyxie@google.com>
Cr-Commit-Position: refs/heads/master@{#545005}

components/download/internal/background_service/logger_impl.cc

@@ -53,6 +53,8 @@ std::string ClientToString(DownloadClient client) {
       return "BackgroundFetch";
     case DownloadClient::DEBUGGING:
       return "Debugging";
+    case DownloadClient::MOUNTAIN_INTERNAL:
+      return "MountainInternal";
     case DownloadClient::BOUNDARY:  // Intentional fallthrough.
     default:
       NOTREACHED();

components/download/internal/background_service/proto/entry.proto

@@ -21,7 +21,8 @@ enum DownloadClient {
   OFFLINE_PAGE_PREFETCH = 4;
   BACKGROUND_FETCH = 5;
   DEBUGGING = 6;
-  BOUNDARY = 7;
+  MOUNTAIN_INTERNAL = 7;
+  BOUNDARY = 8;
 }
 
 // Stores the request params, internal state, metrics and metadata associated

components/download/internal/background_service/proto_conversions.cc

@@ -68,6 +68,8 @@ protodb::DownloadClient ProtoConversions::DownloadClientToProto(
       return protodb::DownloadClient::BACKGROUND_FETCH;
     case DownloadClient::DEBUGGING:
       return protodb::DownloadClient::DEBUGGING;
+    case DownloadClient::MOUNTAIN_INTERNAL:
+      return protodb::DownloadClient::MOUNTAIN_INTERNAL;
     case DownloadClient::BOUNDARY:
       return protodb::DownloadClient::BOUNDARY;
   }
@@ -93,6 +95,8 @@ DownloadClient ProtoConversions::DownloadClientFromProto(
       return DownloadClient::BACKGROUND_FETCH;
     case protodb::DownloadClient::DEBUGGING:
       return DownloadClient::DEBUGGING;
+    case protodb::DownloadClient::MOUNTAIN_INTERNAL:
+      return DownloadClient::MOUNTAIN_INTERNAL;
     case protodb::DownloadClient::BOUNDARY:
       return DownloadClient::BOUNDARY;
   }

components/download/internal/background_service/stats.cc

@@ -91,6 +91,8 @@ std::string ClientToHistogramSuffix(DownloadClient client) {
       return "BackgroundFetch";
     case DownloadClient::DEBUGGING:
       return "Debugging";
+    case DownloadClient::MOUNTAIN_INTERNAL:
+      return "MountainInternal";
     case DownloadClient::BOUNDARY:
       NOTREACHED();
       break;

components/download/public/background_service/clients.h

@@ -37,7 +37,9 @@ enum class DownloadClient {
   // Used by debug surfaces in the app (the WebUI, for example).
   DEBUGGING = 3,
 
-  BOUNDARY = 4,
+  MOUNTAIN_INTERNAL = 4,
+
+  BOUNDARY = 5,
 };
 
 using DownloadClientMap = std::map<DownloadClient, std::unique_ptr<Client>>;

tools/metrics/histograms/histograms.xml

@@ -106924,6 +106924,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <suffix name="OfflinePage" label="Offline page prefetch."/>
   <suffix name="BackgroundFetch" label="Background fetch."/>
   <suffix name="Debugging" label="Debugging client."/>
+  <suffix name="MountainInternal" label="Mountain internal client."/>
   <affected-histogram name="Download.Service.Request.ClientAction"/>
   <affected-histogram name="Download.Service.Request.StartResponse"/>
   <affected-histogram name="Download.Service.Request.StartResult"/>