Add oom tab killing and the about:discards page on linux

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
diff --git a/chrome/browser/browser_process_impl.cc b/chrome/browser/browser_process_impl.cc
index 3b182fc786fff508ccf04498133eda13f4ca9d2d..888631deb6c96db4c958e17d33aadb098da6f522 100644
--- a/chrome/browser/browser_process_impl.cc
+++ b/chrome/browser/browser_process_impl.cc
@@ -147,7 +147,7 @@
 #include "chrome/browser/media/webrtc_log_uploader.h"
 #endif
 
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#if defined(OS_WIN) || defined(OS_CHROMEOS) || defined(OS_LINUX)
 #include "chrome/browser/memory/oom_priority_manager.h"
 #endif
 
@@ -774,7 +774,7 @@ gcm::GCMDriver* BrowserProcessImpl::gcm_driver() {
 
 memory::OomPriorityManager* BrowserProcessImpl::GetOomPriorityManager() {
   DCHECK(CalledOnValidThread());
-#if defined(OS_WIN) || defined(OS_CHROMEOS)
+#if defined(OS_WIN) || defined(OS_CHROMEOS) || defined(OS_LINUX)
   if (!oom_priority_manager_.get())
     oom_priority_manager_.reset(new memory::OomPriorityManager());
   return oom_priority_manager_.get();