DOM generation: support WebKit [Supplemental=Foo] and [Supplemented] attributes

[rakudrama]

There is a comment in WebCore/bindings/scripts/generate-bindings.pl that describes these new attributes.

This work item is to support the new attributes directly.

To support the attributes, databasebuilder.py needs to:

(1) Be able to rename the target in Supplemental=Target Remove members with a [Supplemented] attribute
(3) Apply existing supplementation logic to the 'target'
(4) Omit the supplemental idl from the database.

Only (4) is needed immediately.

From generate-bindings.pl:

FIXME(haraken): Remove this if-else statement.

This if-else statement is temporary and will be removed

after build scripts for all platforms support [Supplemental] IDL.

The motivation for the [Supplemented] IDL is as follows:

In order to support the [Supplemental] IDL, we need to

(1) run resolve-supplemental.pl and generate supplemental_dependency.tmp

(2) and run generate-bindings.pl with the supplemental_dependency.tmp.

This build flow requires a change on the following build scripts,

but changing all the build scripts all at once without any regression is too difficult:

- DerivedSources.make

- DerivedSources.pri

- GNUmakefile.am

- PlatformBlackBerry.cmake

- UseJSC.cmake

- UseV8.cmake

- WebCore.vcproj/MigrateScripts

- WebCore.vcproj/WebCore.vcproj

- bindings/gobject/GNUmakefile.am

- WebCore.gyp/WebCore.gyp

Thus, we are planning to change the build scripts one by one, which implies that

we need to allow the temporary state in which some build scripts support [Supplemental] IDL

but others do not. To accomplish this, we introduce a temporal IDL, [Supplemented].

The [Supplemented] IDL on an attribute means that the attribute is marked with [Supplemental]

in another IDL file somewhere, like this:

DOMWindowWebAudio.idl:

interface [

Supplemental=DOMWindow

] DOMWindowWebAudio {

attribute attr1;

attribute attr2;

};

DOMWindow.idl:

interface [

] DOMWindow {

attribute [Supplemented] attr1; // This line will be removed after all build scripts support the [SupplementalL.

attribute [Supplemented] attr2; // This line will be removed after all build scripts support the [SupplementalL.

attribute attr3;

attribute attr4;

};

Assuming these IDL files, the below code is doing the following logic:

- If a given build script supports the [Supplemental] IDL (i.e. --supplementalDependencyFile is specified),

we ignore all attributes with the [Supplemented] IDL.

- Otherwise (i.e. --supplementalDependencyFile is not specified),

we treat all attributes with the [Supplemented] IDL as normal attributes

and instead ignore all attributes with the [Supplemental] IDL

(i.e. we generate nothing from the idl file with the [Supplemental] IDL).

[vsmenon]

Removed Area-UI label.
Added Area-DOM label.

[vsmenon]

Added Fixed label.