Developer Feature: Add Debug Accelerators to Toggle Touchscreen/Touchpad On or Off (CrOS)

chrome/browser/chromeos/system/input_device_settings.cc

Index: chrome/browser/chromeos/system/input_device_settings.cc
diff --git a/chrome/browser/chromeos/system/input_device_settings.cc b/chrome/browser/chromeos/system/input_device_settings.cc
index bb738b57681c8996b87d0c9c3d2bfc4ba4dd9334..dfb5d2135b6eb8d0c8faae9eeee0385f6d49dc71 100644
--- a/chrome/browser/chromeos/system/input_device_settings.cc
+++ b/chrome/browser/chromeos/system/input_device_settings.cc
@@ -4,10 +4,14 @@
 
 #include "chrome/browser/chromeos/system/input_device_settings.h"
 
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/policy/browser_policy_connector_chromeos.h"
 #include "chrome/browser/chromeos/policy/device_cloud_policy_manager_chromeos.h"
+#include "chrome/common/pref_names.h"
 #include "chromeos/system/statistics_provider.h"
+#include "ui/base/touch/touch_enabled.h"
 
 namespace chromeos {
 namespace system {
@@ -216,5 +220,56 @@ bool InputDeviceSettings::ForceKeyboardDrivenUINavigation() {
   return false;
 }
 
+// static
+void InputDeviceSettings::RegisterPrefs(PrefRegistrySimple* registry) {
+  registry->RegisterBooleanPref(::prefs::kTouchScreenEnabled, true);
+  registry->RegisterBooleanPref(::prefs::kTouchPadEnabled, true);
+}
+
+void InputDeviceSettings::InitTouchDevicesStatusFromLocalPrefs() {
+  bool touch_screen_status = true;
+  bool touch_pad_status = true;
+
+  PrefService* local_state = g_browser_process->local_state();

[oshima, 2015/10/29 23:38:43]

can this be null?

[afakhry, 2015/10/30 05:18:03]

I'm not sure. We already have some code that check for null like 
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/ui/...

And

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/saf...

Added DCHECKs instead.

+  if (local_state) {
+    if (local_state->HasPrefPath(::prefs::kTouchScreenEnabled)) {
+      touch_screen_status =
+          local_state->GetBoolean(::prefs::kTouchScreenEnabled);
+    }
+
+    if (local_state->HasPrefPath(::prefs::kTouchPadEnabled))
+      touch_pad_status = local_state->GetBoolean(::prefs::kTouchPadEnabled);
+  }
+
+  ui::SetTouchEventsEnabled(touch_screen_status);
+  SetInternalTouchpadEnabled(touch_pad_status);
+}
+
+void InputDeviceSettings::ToggleTouchscreen() {
+  PrefService* local_state = g_browser_process->local_state();
+  if (!local_state)
+    return;
+
+  bool touch_screen_status = true;
+  if (local_state->HasPrefPath(::prefs::kTouchScreenEnabled))
+    touch_screen_status = local_state->GetBoolean(::prefs::kTouchScreenEnabled);
+
+  local_state->SetBoolean(::prefs::kTouchScreenEnabled, !touch_screen_status);
+  ui::SetTouchEventsEnabled(!touch_screen_status);
+}
+
+void InputDeviceSettings::ToggleTouchpad() {
+  PrefService* local_state = g_browser_process->local_state();
+  if (!local_state)
+    return;
+
+  bool touch_pad_status = true;
+  if (local_state->HasPrefPath(::prefs::kTouchPadEnabled))
+    touch_pad_status = local_state->GetBoolean(::prefs::kTouchPadEnabled);
+
+  local_state->SetBoolean(::prefs::kTouchPadEnabled, !touch_pad_status);
+  SetInternalTouchpadEnabled(!touch_pad_status);
+}
+
 }  // namespace system
 }  // namespace chromeos