cros: Log per-process memory use on low memory events

chrome/browser/ui/webui/about_ui.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/ui/webui/about_ui.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 555 matching lines @@
                                        refresh,
                                        request_id));
 }
 
 std::string AboutDiscardsRun() {
   std::string output;
   AppendHeader(&output, 0, "About discards");
   output.append(StringPrintf("<meta http-equiv=\"refresh\" content=\"2;%s\">",
                              chrome::kChromeUIDiscardsURL));
   output.append(WrapWithTag("p", "Discarding a tab..."));
-  g_browser_process->oom_priority_manager()->DiscardTab();
+  g_browser_process->oom_priority_manager()->LogMemoryAndDiscardTab();
   AppendFooter(&output);
   return output;
 }
 
 std::string AboutDiscards(const std::string& path) {
   std::string output;
   const char kRunCommand[] = "run";
   if (path == kRunCommand)
     return AboutDiscardsRun();
   AppendHeader(&output, 0, "About discards");
@@ skipping 274 matching lines @@
 }
 
 void FinishMemoryDataRequest(const std::string& path,
                              AboutUIHTMLSource* source,
                              int request_id) {
   if (path == kStringsJsPath) {
     // The AboutMemoryHandler cleans itself up, but |StartFetch()| will want
     // the refcount to be greater than 0.
     scoped_refptr<AboutMemoryHandler>
         handler(new AboutMemoryHandler(source, request_id));
-    handler->StartFetch();
+    // TODO(jamescook): Maybe this shouldn't update UMA?
+    handler->StartFetch(MemoryDetails::UPDATE_USER_METRICS);
   } else {
     source->FinishDataRequest(
         ResourceBundle::GetSharedInstance().GetRawDataResource(
             path == kMemoryJsPath ? IDR_ABOUT_MEMORY_JS :
                 IDR_ABOUT_MEMORY_HTML).as_string(), request_id);
   }
 }
 
 // Handler for filling in the "about:stats" page, as called by the browser's
 // About handler processing.
@@ skipping 624 matching lines @@
 }
 
 AboutUI::AboutUI(content::WebUI* web_ui, const std::string& name)
     : WebUIController(web_ui) {
   Profile* profile = Profile::FromWebUI(web_ui);
   ChromeURLDataManager::DataSource* source =
       new AboutUIHTMLSource(name, profile);
   if (source)
     profile->GetChromeURLDataManager()->AddDataSource(source);
 }