Implement DeviceLight

public/platform/Platform.h

Index: public/platform/Platform.h
diff --git a/public/platform/Platform.h b/public/platform/Platform.h
index 9f5f30227b9327383e6655966cd0141187ba4f5e..ec215d2c3596f5a02d894b82ed49acbc0c07c2b1 100644
--- a/public/platform/Platform.h
+++ b/public/platform/Platform.h
@@ -62,6 +62,7 @@ class WebCompositorSupport;
 class WebCookieJar;
 class WebCrypto;
 class WebDatabaseObserver;
+class WebDeviceLightListener;
 class WebDeviceMotionListener;
 class WebDeviceOrientationListener;
 class WebDiscardableMemory;
@@ -597,16 +598,21 @@ public:
     virtual WebCrypto* crypto() { return 0; }
 
 
-    // Device Motion / Orientation ----------------------------------------
+    // Device Motion / Orientation / Light ----------------------------------------
 
     // Sets a Listener to listen for device motion data updates.
     // If null, the platform stops providing device motion data to the current listener.
     virtual void setDeviceMotionListener(blink::WebDeviceMotionListener*) { }
 
     // Sets a Listener to listen for device orientation data updates.
-    // If null, the platform stops proving device orientation data to the current listener.
+    // If null, the platform stops providing device orientation data to the current listener.
     virtual void setDeviceOrientationListener(blink::WebDeviceOrientationListener*) { }
 
+    // Sets a Listener to listen for device light data updates.
+    // If null, the platform stops providing device light data to the current listener.
+    virtual void setDeviceLightListener(blink::WebDeviceLightListener*) { }
+
+
     // Screen Orientation -------------------------------------------------
 
     virtual void setScreenOrientationListener(blink::WebScreenOrientationListener*) { }