Add MediaKeySession.expiration attribute.

Source/modules/encryptedmedia/MediaKeySession.cpp

Index: Source/modules/encryptedmedia/MediaKeySession.cpp
diff --git a/Source/modules/encryptedmedia/MediaKeySession.cpp b/Source/modules/encryptedmedia/MediaKeySession.cpp
index f48367f4fac55e88c906e2fa35adba6f6844a900..ee97ea232c317f18b65ea46aae48d9e3144a23c6 100644
--- a/Source/modules/encryptedmedia/MediaKeySession.cpp
+++ b/Source/modules/encryptedmedia/MediaKeySession.cpp
@@ -49,6 +49,8 @@
 #include "public/platform/WebURL.h"
 #include "wtf/ArrayBuffer.h"
 #include "wtf/ArrayBufferView.h"
+#include <cmath>
+#include <limits>

[sandersd (OOO until July 31), 2014/10/01 22:57:52]

These should be between the two exiting #include blocks.

[jrummell, 2014/10/03 00:36:10]

Blink style guide says this is correct (and the presubmit check complains if
done the other way).
http://www.chromium.org/blink/coding-style#TOC-include-Statements

 
 namespace blink {
 
@@ -218,6 +220,7 @@ MediaKeySession::MediaKeySession(ScriptState* scriptState, MediaKeys* mediaKeys,
     , m_asyncEventQueue(GenericEventQueue::create(this))
     , m_mediaKeys(mediaKeys)
     , m_sessionType(sessionType)
+    , m_expiration(std::numeric_limits<double>::quiet_NaN())
     , m_isUninitialized(true)
     , m_isCallable(false)
     , m_isClosed(false)
@@ -238,7 +241,7 @@ MediaKeySession::MediaKeySession(ScriptState* scriptState, MediaKeys* mediaKeys,
     ASSERT(sessionId().isEmpty());
 
     // 2.2 Let the expiration attribute be NaN.
-    // FIXME: Add expiration property.
+    ASSERT(std::isnan(m_expiration));
 
     // 2.3 Let the closed attribute be a new promise.
     ASSERT(!closed(scriptState).isUndefinedOrNull());
@@ -605,6 +608,11 @@ void MediaKeySession::error(WebContentDecryptionModuleException exception, unsig
     error(errorCode, systemCode);
 }
 
+void MediaKeySession::expirationChanged(double updatedExpiryTimeInMS)
+{
+    m_expiration = updatedExpiryTimeInMS;
+}
+
 const AtomicString& MediaKeySession::interfaceName() const
 {
     return EventTargetNames::MediaKeySession;