Add sysexEnabled readonly attribute to MIDIAccess

public/web/WebMIDIClientMock.h

Index: public/web/WebMIDIClientMock.h
diff --git a/public/web/WebMIDIClientMock.h b/public/web/WebMIDIClientMock.h
index 95ba401fa2cd9e1450d3688cb2993ab0506bade3..ce5a261ba4baeaaf73b95ecdef528323665d1185 100644
--- a/public/web/WebMIDIClientMock.h
+++ b/public/web/WebMIDIClientMock.h
@@ -46,12 +46,20 @@ public:
     BLINK_EXPORT WebMIDIClientMock();
     virtual ~WebMIDIClientMock() { reset(); }
 
-    BLINK_EXPORT void setSysExPermission(bool);
+    BLINK_EXPORT void setSysexPermission(bool);
     BLINK_EXPORT void resetMock();
 
+    // FIXME: Remove following function once Chromium stop using it.
+    void setSysExPermission(bool permission) { setSysexPermission(permission); }
+
     // WebMIDIClient
-    virtual void requestSysExPermission(const WebMIDIPermissionRequest&) OVERRIDE;
-    virtual void cancelSysExPermissionRequest(const WebMIDIPermissionRequest&) OVERRIDE;
+    virtual void requestSysexPermission(const WebMIDIPermissionRequest&) OVERRIDE;
+    virtual void cancelSysexPermissionRequest(const WebMIDIPermissionRequest&) OVERRIDE;
+
+    // FIXME: Remove following old functions once Chromium uses new functions.
+    virtual void requestSysExPermission(const WebMIDIPermissionRequest& request) { requestSysexPermission(request); }
+    virtual void cancelSysExPermissionRequest(const WebMIDIPermissionRequest& request) { cancelSysexPermissionRequest(request); }
+
 
 private:
     BLINK_EXPORT void reset();