Implement Permission change observing in Blink.

Source/modules/permissions/Permissions.cpp

Index: Source/modules/permissions/Permissions.cpp
diff --git a/Source/modules/permissions/Permissions.cpp b/Source/modules/permissions/Permissions.cpp
index 0fdb4d44b5e335c9a03b5f11e047e8eb1c72a1aa..b4ee0cffdf52c2a97e9bf107a228e8053b7af0e7 100644
--- a/Source/modules/permissions/Permissions.cpp
+++ b/Source/modules/permissions/Permissions.cpp
@@ -66,7 +66,7 @@ ScriptPromise Permissions::query(ScriptState* scriptState, const ScriptValue& ra
         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.

@@ -74,7 +74,7 @@ ScriptPromise Permissions::query(ScriptState* scriptState, const ScriptValue& ra
         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;