https://bugs.webkit.org/show_bug.cgi?id=80400

Source/WebCore:

This change modifies the default ImageDecoder for Qt-port from QImageDecoder to WebCore ImageDecoder.
The new behavior is to use QImageDecoder only if WebCoreImageDecoder - and the platform - doesn't support
the requested image type.
The WTF_USE_QT_IMAGE_DECODER macro has been removed, since it is no longer needed.

This change adds build depedency (except Qt-MAC and Qt-WIN platform) for libpng-dev and libjpeg-dev packages,
because PNG and JPEG imagedecoders need not only these libraries, but their headers also. Qmake-config
tests for these libraries were introduced in r110045.

Notice: with using libjpeg-turbo as a system library I measured 10% performance improvement on Methanol benchmark
(collection of popular sites, page-loading benchmark) with this patch.

Reviewed by Simon Hausmann.

No new tests needed.

* Target.pri: Move WebCore ImageDecoder files out of guards. Remove ImageFrameQt.cpp from sources.
* WebCore.pri: Move WebCore ImageDecoder include paths out of guards.
* platform/MIMETypeRegistry.cpp:
(WebCore::initializeSupportedImageMIMETypes): Add WebCore supported and Qt supported MIME types.
(WebCore::initializeSupportedImageMIMETypesForEncoding): Use Qt supported MIME types.
* platform/graphics/ImageSource.cpp: Remove unnecessary includes.
* platform/graphics/ImageSource.h: Remove unnecessary typedefs.
(WebCore):
* platform/graphics/qt/ImageDecoderQt.cpp: Remove ImageDecoder::create, since it is no longer needed.
(WebCore::ImageDecoderQt::filenameExtension): Remove unnecessary semicolon.
(WebCore::ImageDecoderQt::internalHandleCurrentImage): Use QImage and ImageFrame instead of QPixmap.
(WebCore):
(WebCore::ImageFrame::asNewNativeImage): Moved here from removed ImageFrameQt.cpp.
* platform/image-decoders/ImageDecoder.cpp: Reorganize the includes of the header.
(WebCore::ImageDecoder::create): Add platform macro guarded fallback case for QImageDecoder. Add guards
for JPEG, PNG, ICO decoder for Qt-MAC and Qt-WIN platform.
* platform/image-decoders/ImageDecoder.h: Remove Qt-specific codes.
(WebCore::ImageFrame::getAddr): Remove Qt-specific case, since it is no longer needed.
(ImageFrame):
* platform/image-decoders/qt/ImageFrameQt.cpp: Removed. Dead code, other code has been moved to
ImageDecoderQt.cpp.

Source/WebKit/blackberry:

Get rid of QT_IMAGE_DECODER flag.

Reviewed by Simon Hausmann.

* WebCoreSupport/AboutDataEnableFeatures.in:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@118909 268f45cc-cd09-0410-ab3c-d52691b4dbfc