[PresentationAPI] Plumbing send() from PresentationSession IDL to platform/.

Source/modules/presentation/PresentationSession.cpp

Index: Source/modules/presentation/PresentationSession.cpp
diff --git a/Source/modules/presentation/PresentationSession.cpp b/Source/modules/presentation/PresentationSession.cpp
index 47ba6253b3d33c471419808f6e6918b48f272bdd..b4a0ec9be96c6242083d4520e4ecc7d6442b1c0b 100644
--- a/Source/modules/presentation/PresentationSession.cpp
+++ b/Source/modules/presentation/PresentationSession.cpp
@@ -5,7 +5,10 @@
 #include "config.h"
 #include "modules/presentation/PresentationSession.h"
 
+#include "core/dom/DOMArrayBuffer.h"
+#include "core/dom/DOMArrayBufferView.h"
 #include "core/dom/Document.h"
+#include "core/dom/ExceptionCode.h"
 #include "core/events/Event.h"
 #include "core/frame/LocalFrame.h"
 #include "modules/EventTargetModules.h"
@@ -36,6 +39,11 @@ const AtomicString& SessionStateToString(WebPresentationSessionState state)
     return disconnectedValue;
 }
 
+void throwPresentationDisconnectedError(ExceptionState& exceptionState)
+{
+    exceptionState.throwDOMException(InvalidStateError, "Presentation session is disconnected.");
+}
+
 } // namespace
 
 PresentationSession::PresentationSession(LocalFrame* frame, const String& id, const String& url)
@@ -90,8 +98,41 @@ const AtomicString& PresentationSession::state() const
     return SessionStateToString(m_state);
 }
 
-void PresentationSession::postMessage(const String& message)
+void PresentationSession::send(const String& message, ExceptionState& exceptionState)
+{
+    if (m_state == WebPresentationSessionState::Disconnected) {
+        throwPresentationDisconnectedError(exceptionState);
+        return;
+    }
+
+    PresentationController* controller = presentationController();
+    if (controller)
+        controller->send(m_url, m_id, message);
+}
+
+void PresentationSession::send(PassRefPtr<DOMArrayBuffer> data, ExceptionState& exceptionState)
 {
+    ASSERT(data && data->buffer());
+    sendInternal(static_cast<const uint8_t*>(data->data()), data->byteLength(), exceptionState);
+}
+
+void PresentationSession::send(PassRefPtr<DOMArrayBufferView> data, ExceptionState& exceptionState)
+{
+    ASSERT(data);
+    sendInternal(static_cast<const uint8_t*>(data->baseAddress()), data->byteLength(), exceptionState);
+}
+
+void PresentationSession::sendInternal(const uint8_t* data, size_t size, ExceptionState& exceptionState)
+{
+    ASSERT(data);
+    if (m_state == WebPresentationSessionState::Disconnected) {
+        throwPresentationDisconnectedError(exceptionState);
+        return;
+    }
+
+    PresentationController* controller = presentationController();
+    if (controller)
+        controller->send(m_url, m_id, data, size);
 }
 
 void PresentationSession::close()