Enable dark_resume_always workaround if the wake-on-packets flag is set

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index da1c2b50f824061fe8431b3c1b5a96837cdfd4df..598fccbf65c3ddbc2abfa4bde8e28ab760677c0a 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -132,6 +132,11 @@ namespace chromeos {
 
 namespace {
 
+// TODO(chirantan): These are used by a temporary workaround for lucid sleep and
+// should be removed once the proper implementation is ready (crbug.com/414949).
+const char kDarkResumeAlwaysFile[] = "/sys/power/dark_resume_always";
+const char kEnableDarkResumeAlways[] = "1";
+
 void ChromeOSVersionCallback(const std::string& version) {
   base::SetLinuxDistro(std::string("CrOS ") + version);
 }
@@ -566,9 +571,22 @@ void ChromeBrowserMainPartsChromeos::PostProfileInit() {
   renderer_freezer_.reset(
       new RendererFreezer(scoped_ptr<RendererFreezer::Delegate>(
           new FreezerCgroupProcessManager())));
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kWakeOnPackets))
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kWakeOnPackets)) {
     light_bar_.reset(new LightBar());
 
+    // Until the kernel can properly detect the wakeup source, we need to use a
+    // hack to tell the kernel to always enter dark resume.  Chrome can then
+    // detect any user activity and have the power manager transition out of
+    // dark resume into regular resume.  We don't care if the write succeeds or
+    // not because most devices will not have this file.
+    //
+    // TODO(chirantan): Remove this once we can properly detect the wakeup
+    // source (crbug.com/414949).
+    base::WriteFile(base::FilePath(kDarkResumeAlwaysFile),

[Daniel Erat, 2014/09/21 14:49:31]

can you put this somewhere else instead of chrome_browser_main_chromeos.cc?

+                    kEnableDarkResumeAlways,
+                    strlen(kEnableDarkResumeAlways));
+  }
+
   g_browser_process->platform_part()->InitializeAutomaticRebootManager();
 
   // This observer cannot be created earlier because it requires the shell to be