Added memory pressure monitor for linux.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 203400ea7757b12c8581abdb4556a2f1bca2f863..a6b7d6d93bd3e8367bdc1b1635d3f13aa54e9fca 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -98,7 +98,6 @@
 #endif
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
-#include "base/memory/memory_pressure_monitor_mac.h"
 #include "content/browser/bootstrap_sandbox_mac.h"
 #include "content/browser/browser_io_surface_manager_mac.h"
 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
@@ -112,7 +111,6 @@
 #include <commctrl.h>
 #include <shellapi.h>
 
-#include "base/memory/memory_pressure_monitor_win.h"
 #include "content/browser/system_message_window_win.h"
 #include "content/common/sandbox_win.h"
 #include "net/base/winsock_init.h"
@@ -120,7 +118,6 @@
 #endif
 
 #if defined(OS_CHROMEOS)
-#include "base/memory/memory_pressure_monitor_chromeos.h"
 #include "chromeos/chromeos_switches.h"
 #endif
 
@@ -332,12 +329,12 @@ base::win::MemoryPressureMonitor* CreateWinMemoryPressureMonitor(
       base::StringToInt(thresholds[1], &critical_threshold_mb) &&
       moderate_threshold_mb >= critical_threshold_mb &&
       critical_threshold_mb >= 0) {
-    return new base::win::MemoryPressureMonitor(moderate_threshold_mb,
-                                                critical_threshold_mb);
+    return new base::MemoryPressureMonitor(moderate_threshold_mb,
+                                           critical_threshold_mb);
   }
 
   // In absence of valid switches use the automatic defaults.
-  return new base::win::MemoryPressureMonitor();
+  return new base::MemoryPressureMonitor();
 }
 #endif  // defined(OS_WIN)
 
@@ -661,11 +658,11 @@ int BrowserMainLoop::PreCreateThreads() {
   // once MemoryPressureMonitor is made a concrete class.
 #if defined(OS_CHROMEOS)
   if (chromeos::switches::MemoryPressureHandlingEnabled()) {
-    memory_pressure_monitor_.reset(new base::chromeos::MemoryPressureMonitor(
+    memory_pressure_monitor_.reset(new base::MemoryPressureMonitor(
         chromeos::switches::GetMemoryPressureThresholds()));
   }
-#elif defined(OS_MACOSX) && !defined(OS_IOS)
-  memory_pressure_monitor_.reset(new base::mac::MemoryPressureMonitor());
+#elif defined(OS_LINUX) || (defined(OS_MACOSX) && !defined(OS_IOS))
+  memory_pressure_monitor_.reset(new base::MemoryPressureMonitor());
 #elif defined(OS_WIN)
   memory_pressure_monitor_.reset(CreateWinMemoryPressureMonitor(
       parsed_command_line_));