[ScreenOrientation] Add use counters.

Source/modules/screen_orientation/ScreenOrientation.cpp

Index: Source/modules/screen_orientation/ScreenOrientation.cpp
diff --git a/Source/modules/screen_orientation/ScreenOrientation.cpp b/Source/modules/screen_orientation/ScreenOrientation.cpp
index 0172e47e2fe29d1d00ef5bd28a7fd6826cbd2f87..08076c116c96590b03d3609cafcd37c0b82b7b94 100644
--- a/Source/modules/screen_orientation/ScreenOrientation.cpp
+++ b/Source/modules/screen_orientation/ScreenOrientation.cpp
@@ -11,6 +11,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
 #include "modules/EventTargetModules.h"
 #include "modules/screen_orientation/LockOrientationCallback.h"
 #include "modules/screen_orientation/ScreenOrientationController.h"
@@ -126,11 +127,15 @@ ExecutionContext* ScreenOrientation::executionContext() const
 
 String ScreenOrientation::type() const
 {
+    if (m_frame)

[Peter Beverloo, 2014/10/02 12:30:07]

Please move these to ScreenOrientation.idl using the [MeasureAs] annotation.

+        UseCounter::count(m_frame->document(), UseCounter::ScreenOrientationType);
     return orientationTypeToString(m_type);
 }
 
 unsigned short ScreenOrientation::angle() const
 {
+    if (m_frame)
+        UseCounter::count(m_frame->document(), UseCounter::ScreenOrientationAngle);
     return m_angle;
 }
 
@@ -150,6 +155,7 @@ ScriptPromise ScreenOrientation::lock(ScriptState* state, const AtomicString& lo
     ScriptPromise promise = resolver->promise();
 
     Document* document = m_frame ? m_frame->document() : 0;
+    UseCounter::count(document, UseCounter::ScreenOrientationLock);
 
     if (!document || !controller()) {
         RefPtrWillBeRawPtr<DOMException> exception = DOMException::create(InvalidStateError, "The object is no longer associated to a document.");