Web MIDI: introduce WebMIDIClient API to request a permission

Source/core/platform/midi/MIDIAccessor.cpp

Index: Source/core/platform/midi/MIDIAccessor.cpp
diff --git a/Source/core/platform/midi/MIDIAccessor.cpp b/Source/core/platform/midi/MIDIAccessor.cpp
index a5f602b6a87174f931d0c45a4d1ce9c3834cbb06..8c0ad70264101caec8785f34160b76ed8061279f 100644
--- a/Source/core/platform/midi/MIDIAccessor.cpp
+++ b/Source/core/platform/midi/MIDIAccessor.cpp
@@ -56,9 +56,10 @@ MIDIAccessor::MIDIAccessor(MIDIAccessorClient* client)
     ASSERT(m_accessor);
 }
 
-void MIDIAccessor::requestAccess(bool access)
+void MIDIAccessor::startSession()
 {
-    m_accessor->requestAccess(access);
+    // FIXME: Use new API once embedder side implement the new API.
+    m_accessor->requestAccess(false);
 }
 
 void MIDIAccessor::sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
@@ -76,14 +77,19 @@ void MIDIAccessor::didAddOutputPort(const WebString& id, const WebString& manufa
     m_client->didAddOutputPort(id, manufacturer, name, version);
 }
 
+void MIDIAccessor::didStartSession()
+{
+    m_client->didStartSession();
+}
+
 void MIDIAccessor::didAllowAccess()
 {
-    m_client->didAllowAccess();
+    m_client->didStartSession();
 }
 
 void MIDIAccessor::didBlockAccess()
 {
-    m_client->didBlockAccess();
+    m_client->didStartSession();
 }
 
 void MIDIAccessor::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)