Use event init dictionary in modules/device_light

Source/modules/device_light/DeviceLightEvent.cpp

Index: Source/modules/device_light/DeviceLightEvent.cpp
diff --git a/Source/modules/device_light/DeviceLightEvent.cpp b/Source/modules/device_light/DeviceLightEvent.cpp
index 994629388b6a488d7451ec8564dfd62928a045a4..cb5cc9e027c7e4b8e100eb83ac414d5434e08aa9 100644
--- a/Source/modules/device_light/DeviceLightEvent.cpp
+++ b/Source/modules/device_light/DeviceLightEvent.cpp
@@ -24,8 +24,10 @@ DeviceLightEvent::DeviceLightEvent(const AtomicString& eventType, double value)
 
 DeviceLightEvent::DeviceLightEvent(const AtomicString& eventType, const DeviceLightEventInit& initializer)
     : Event(eventType, initializer)
-    , m_value(initializer.value)
+    , m_value(std::numeric_limits<double>::infinity())

[haraken, 2014/12/03 04:31:06]

Doesn't this change existing behavior? I guess the default value was 0 before
this CL.

[bashi, 2014/12/03 04:36:48]

This CL changes "bubbles" behavior, but doesn't changes "value" behavior. It is
(and was) initialized with positive infinity. The spec also says it should be
initialized with positive infinity.

"If the implementation is unable to report the current light level, initialize
the value attribute to positive Infinity, otherwise initialize the attribute to
the current light level."

[haraken, 2014/12/03 04:38:36]

ah, makes sense. Thanks.

 {
+    if (initializer.hasValue())

[timvolodine, 2014/12/03 12:37:51]

is this always false now?

+        m_value = initializer.value();

[timvolodine, 2014/12/03 12:37:51]

can this be initialized directly in the member initialization list?

 }
 
 const AtomicString& DeviceLightEvent::interfaceName() const