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

chrome/browser/memory_details_linux.cc

 // Copyright (c) 2011 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/memory_details.h"
 
 #include <dirent.h>
 #include <fcntl.h>
 #include <unistd.h>
 
@@ skipping 49 matching lines @@
   { "firefox-bin", FIREFOX },
   { "iceweasel", ICEWEASEL },
   { "opera", OPERA },
   { "konqueror", KONQUEROR },
   { "epiphany-browse", EPIPHANY },
   { "epiphany", EPIPHANY },
   { "midori", MIDORI },
   { "", MAX_BROWSERS },
 };
 
-MemoryDetails::MemoryDetails() {
+MemoryDetails::MemoryDetails()
+    : user_metrics_mode_(UPDATE_USER_METRICS) {
 }
 
 ProcessData* MemoryDetails::ChromeBrowser() {
   return &process_data_[0];
 }
 
 struct Process {
   pid_t pid;
   pid_t parent;
   std::string name;
@@ skipping 201 matching lines @@
     }
 
     process_data_.push_back(browser);
   }
 
   // Finally return to the browser thread.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&MemoryDetails::CollectChildInfoOnUIThread, this));
 }