Correcly Report CanEnterMaximizeMode on devices without accelerometers

ash/wm/maximize_mode/maximize_mode_controller.cc

Index: ash/wm/maximize_mode/maximize_mode_controller.cc
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.cc b/ash/wm/maximize_mode/maximize_mode_controller.cc
index 1463a501561d815c07b30ba6d588145174658dfd..83cbc745df39839912baa58bb378cc543b5abd48 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.cc
+++ b/ash/wm/maximize_mode/maximize_mode_controller.cc
@@ -132,12 +132,12 @@ void MaximizeModeController::AddWindow(aura::Window* window) {
 #if defined(OS_CHROMEOS)
 void MaximizeModeController::OnAccelerometerUpdated(
     const ui::AccelerometerUpdate& update) {
-  bool first_accelerometer_update = !have_seen_accelerometer_data_;
-  have_seen_accelerometer_data_ = true;
-
   if (!update.has(ui::ACCELEROMETER_SOURCE_SCREEN))
     return;
 
+  bool first_accelerometer_update = !have_seen_accelerometer_data_;
+  have_seen_accelerometer_data_ = true;
+
   // Whether or not we enter maximize mode affects whether we handle screen
   // rotation, so determine whether to enter maximize mode first.
   if (!update.has(ui::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD)) {