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

chrome/browser/chromeos/power/light_bar.cc

Index: chrome/browser/chromeos/power/light_bar.cc
diff --git a/chrome/browser/chromeos/power/light_bar.cc b/chrome/browser/chromeos/power/light_bar.cc
index 92c2033994547c714642c362bbe41c8980ff0ef9..b6b9bcb0b8345ba490dbac8e7b7e76793d384da4 100644
--- a/chrome/browser/chromeos/power/light_bar.cc
+++ b/chrome/browser/chromeos/power/light_bar.cc
@@ -22,12 +22,29 @@ const char kLightBarControlPath[] =
     "lightbar/sequence";
 const char kKonamiCommand[] = "KONAMI";
 
+// 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";
+
 }  // namespace
 
 LightBar::LightBar()
     : control_path_(base::FilePath(kLightBarControlPath)),
       has_light_bar_(base::PathIsWritable(control_path_)) {
   DBusThreadManager::Get()->GetPowerManagerClient()->AddObserver(this);
+
+  // 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),
+                  kEnableDarkResumeAlways,
+                  strlen(kEnableDarkResumeAlways));
 }
 
 LightBar::~LightBar() {