Adding flag to specify the used memory pressure strategy

chromeos/chromeos_switches.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 "chromeos/chromeos_switches.h"
 
 #include "base/command_line.h"
 
 namespace chromeos {
 namespace switches {
@@ skipping 195 matching lines @@
 // Specifies the profile to use once a chromeos user is logged in.
 // This parameter is ignored if user goes through login screen since user_id
 // hash defines which profile directory to use.
 // In case of browser restart within active session this parameter is used
 // to pass user_id hash for primary user.
 const char kLoginProfile[] = "login-profile";
 
 // Specifies the user which is already logged in.
 const char kLoginUser[] = "login-user";
 
+// The memory pressure thresholds selection which is used to decide when a
+// memory pressure event needs to get fired.
+const char kMemoryPressureThresholds[] = "memory-pressure-thresholds";
+
 // Enables natural scroll by default.
 const char kNaturalScrollDefault[] = "enable-natural-scroll-default";
 
 // Skips all other OOBE pages after user login.
 const char kOobeSkipPostLogin[] = "oobe-skip-postlogin";
 
 // Disable GAIA services such as enrollment and OAuth session restore. Used by
 // 'fake' telemetry login.
 const char kDisableGaiaServices[] = "disable-gaia-services";
 
@@ skipping 59 matching lines @@
 const char kArtifactsDir[] = "artifacts-dir";
 
 // Bypass proxy for captive portal authorization.
 const char kEnableCaptivePortalBypassProxy[] =
     "enable-captive-portal-bypass-proxy";
 
 bool WakeOnWifiEnabled() {
   return !base::CommandLine::ForCurrentProcess()->HasSwitch(kDisableWakeOnWifi);
 }
 
+base::MemoryPressureObserverChromeOS::MemoryPressureThresholds
+GetMemoryPressureThresholds() {
+  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
+          kMemoryPressureThresholds)) {
+    return base::MemoryPressureObserverChromeOS::
+        MEMORY_PRESSURE_THRESHOLD_DEFAULT;
+  }
+  const std::string option =
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          kMemoryPressureThresholds);
+  if (option == "1")

[Charlie Reis, 2015/01/21 19:37:55]

nit: These all need braces because the body doesn't fit on one line.  (Sorry for
missing this earlier.)

[Mr4D (OOO till 08-26), 2015/01/21 21:01:35]

Done.

+    return base::MemoryPressureObserverChromeOS::
+        MEMORY_PRESSURE_THRESHOLD_CONSERVATIVE;
+  if (option == "2")
+    return base::MemoryPressureObserverChromeOS::
+        MEMORY_PRESSURE_THRESHOLD_AGGRESSIVE_CACHE_DISCARD;
+  if (option == "3")
+    return base::MemoryPressureObserverChromeOS::
+        MEMORY_PRESSURE_THRESHOLD_AGGRESSIVE_TAB_DISCARD;
+  return base::MemoryPressureObserverChromeOS::
+      MEMORY_PRESSURE_THRESHOLD_AGGRESSIVE;
+}
+
 }  // namespace switches
 }  // namespace chromeos