Isolate initiation counts for downloads to their own histograms and improve

chrome/browser/tab_contents/render_view_context_menu.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 <algorithm>
 #include <set>
 #include <utility>
 
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 
@@ skipping 1469 matching lines @@
       OpenURL(params_.link_url,
               GURL(),
               params_.frame_id,
               OFF_THE_RECORD,
               content::PAGE_TRANSITION_LINK);
       break;
 
     case IDC_CONTENT_CONTEXT_SAVEAVAS:
     case IDC_CONTENT_CONTEXT_SAVEIMAGEAS:
     case IDC_CONTENT_CONTEXT_SAVELINKAS: {
-      download_util::RecordDownloadCount(
-          download_util::INITIATED_BY_CONTEXT_MENU_COUNT);
+      download_util::RecordDownloadSource(
+          download_util::INITIATED_BY_CONTEXT_MENU);
       const GURL& referrer =
           params_.frame_url.is_empty() ? params_.page_url : params_.frame_url;
       const GURL& url =
           (id == IDC_CONTENT_CONTEXT_SAVELINKAS ? params_.link_url :
                                                   params_.src_url);
       DownloadManager* dlm =
           DownloadServiceFactory::GetForProfile(profile_)->GetDownloadManager();
       // For images and AV "Save As" context menu commands, save the cached
       // data even if it is no longer valid. This helps ensure that the content
       // that is visible on the page is what is saved. For links, this behavior
@@ skipping 443 matching lines @@
   source_web_contents_->GetRenderViewHost()->
       ExecuteMediaPlayerActionAtLocation(location, action);
 }
 
 void RenderViewContextMenu::PluginActionAt(
     const gfx::Point& location,
     const WebPluginAction& action) {
   source_web_contents_->GetRenderViewHost()->
       ExecutePluginActionAtLocation(location, action);
 }