Implement Permission change observing in Blink.

Source/modules/permissions/Permissions.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "modules/permissions/Permissions.h"
 
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/modules/v8/V8MidiPermissionDescriptor.h"
@@ skipping 46 matching lines @@
     ScriptPromise promise = resolver->promise();
 
     String name = permission.name();
     WebPermissionType type;
     if (name == "geolocation") {
         type = WebPermissionTypeGeolocation;
     } else if (name == "notifications") {
         type = WebPermissionTypeNotifications;
     } else if (name == "push") {
         PushPermissionDescriptor pushPermission = NativeValueTraits<PushPermissionDescriptor>::nativeValue(scriptState->isolate(), rawPermission.v8Value(), exceptionState);
         // The only "userVisible" push is supported for now.

[Miguel Garcia, 2015/04/01 17:41:51]

nit: remove "The"

[mlamouri (slow - plz ping), 2015/04/01 17:53:10]

Done.

[mlamouri (slow - plz ping), 2015/04/01 17:53:10]

Done.

         if (!pushPermission.userVisible()) {
-            resolver->resolve(new PermissionStatus(scriptState->executionContext(), WebPermissionStatusDenied));
+            resolver->resolve(PermissionStatus::create(scriptState->executionContext(), WebPermissionStatusDenied, WebPermissionTypePush));
             return promise;
         }
         type = WebPermissionTypePushNotifications;

[Miguel Garcia, 2015/04/01 17:41:51]

so we still have WebPermissionTypePushNotifications value?

[mlamouri (slow - plz ping), 2015/04/01 17:53:11]

Renaming it will require tree-sided CL because it will break Chromium. It can be
done later.

     } else if (name == "midi") {
         MidiPermissionDescriptor midiPermission = NativeValueTraits<MidiPermissionDescriptor>::nativeValue(scriptState->isolate(), rawPermission.v8Value(), exceptionState);
         // Only sysex usage requires a permission for now.
         if (!midiPermission.sysex()) {
-            resolver->resolve(new PermissionStatus(scriptState->executionContext(), WebPermissionStatusGranted));
+            resolver->resolve(PermissionStatus::create(scriptState->executionContext(), WebPermissionStatusGranted, WebPermissionTypeMidi));
             return promise;
         }
         type = WebPermissionTypeMidiSysEx;
     } else {
         ASSERT_NOT_REACHED();
         type = WebPermissionTypeGeolocation;
     }
 
     // If the current origin is a file scheme, it will unlikely return a
     // meaningful value because most APIs are broken on file scheme and no
     // permission prompt will be shown even if the returned permission will most
     // likely be "prompt".
     client->queryPermission(type, KURL(KURL(), scriptState->executionContext()->securityOrigin()->toString()), new PermissionQueryCallback(resolver, type));
     return promise;
 }
 
 } // namespace blink