Correcly Report CanEnterMaximizeMode on devices without accelerometers

chromeos/accelerometer/accelerometer_reader.cc

Index: chromeos/accelerometer/accelerometer_reader.cc
diff --git a/chromeos/accelerometer/accelerometer_reader.cc b/chromeos/accelerometer/accelerometer_reader.cc
index 4d68ebf0957ec5c811208b2430604a27e489a0da..92f1448e60bbe40a154b1506f5ddeb448d8d3a52 100644
--- a/chromeos/accelerometer/accelerometer_reader.cc
+++ b/chromeos/accelerometer/accelerometer_reader.cc
@@ -203,7 +203,10 @@ void AccelerometerReader::Initialize(
 
 void AccelerometerReader::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
-  observer->OnAccelerometerUpdated(update_);
+  if (update_.has(chromeos::ACCELEROMETER_SOURCE_ATTACHED_KEYBOARD) ||
+      update_.has(chromeos::ACCELEROMETER_SOURCE_SCREEN)) {

[flackr, 2015/02/04 18:44:52]

I'd prefer adding a bool for if it has gotten a reading yet (i.e. if
AccelerometerReader::OnDataRead has been called with success == true).

[jonross, 2015/02/04 19:00:59]

Done.

+    observer->OnAccelerometerUpdated(update_);
+  }
 }
 
 void AccelerometerReader::RemoveObserver(Observer* observer) {