[chromium] Drag image for image elements should be scaled with device scale factor.

[chromium] Drag image for image elements should be scaled with device scale factor.
https://bugs.webkit.org/show_bug.cgi?id=89688

Patch by Varun Jain <varunjain@chromium.org> on 2012-07-18
Reviewed by Adam Barth.

.:

* ManualTests/chromium/drag-image-accounts-for-device-scale.html:

Source/WebCore:

Modified ManualTest: ManualTests/chromium/drag-image-accounts-for-device-scale.html

* page/Frame.cpp:
(WebCore::Frame::nodeImage):
(WebCore::Frame::dragImageForSelection):
* platform/chromium/DragImageChromiumSkia.cpp:
(WebCore::dragImageSize):
(WebCore::deleteDragImage):
(WebCore::scaleDragImage):
(WebCore::dissolveDragImageToFraction):
(WebCore::createDragImageFromImage):
* platform/chromium/DragImageRef.h:
(DragImageChromium):
(WebCore):
* platform/graphics/skia/BitmapImageSingleFrameSkia.h:
(BitmapImageSingleFrameSkia):
* platform/graphics/skia/ImageBufferSkia.cpp:
(WebCore::ImageBuffer::ImageBuffer):
(WebCore::ImageBuffer::copyImage):
* platform/graphics/skia/ImageSkia.cpp:
(WebCore::BitmapImageSingleFrameSkia::BitmapImageSingleFrameSkia):
(WebCore::BitmapImageSingleFrameSkia::create):
* platform/graphics/skia/NativeImageSkia.cpp:
(WebCore::NativeImageSkia::NativeImageSkia):
* platform/graphics/skia/NativeImageSkia.h:
(NativeImageSkia):
(WebCore::NativeImageSkia::resolutionScale):

Source/WebKit/chromium:

* src/DragClientImpl.cpp:
(WebKit::DragClientImpl::startDrag):
* tests/DragImageTest.cpp:
(WebCore::TEST):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@122996 268f45cc-cd09-0410-ab3c-d52691b4dbfc