Incremental cleanup of BitmapImage: inlined virtual functions

Incremental cleanup of BitmapImage: inlined virtual functions
https://bugs.webkit.org/show_bug.cgi?id=81688

Patch by Tom Hudson <tomhudson@google.com> on 2012-03-21
Reviewed by James Robinson.

No change in functionality, so no new tests.

Move virtual functions defined in headers into .cpp files.

* WebCore.gypi:
* platform/graphics/BitmapImage.cpp:
(WebCore::BitmapImage::isBitmapImage):
(WebCore):
(WebCore::BitmapImage::hasSingleSecurityOrigin):
(WebCore::BitmapImage::nativeImageForCurrentFrame):
(WebCore::BitmapImage::currentFrameHasAlpha):
(WebCore::BitmapImage::notSolidColor):
(WebCore::BitmapImage::decodedSize):
(WebCore::BitmapImage::mayFillWithSolidColor):
(WebCore::BitmapImage::solidColor):
* platform/graphics/BitmapImage.h:
(BitmapImage):
* platform/graphics/skia/BitmapImageSingleFrameSkia.cpp: Added.
(WebCore):
(WebCore::BitmapImageSingleFrameSkia::isBitmapImage):
(WebCore::BitmapImageSingleFrameSkia::currentFrameHasAlpha):
(WebCore::BitmapImageSingleFrameSkia::size):
(WebCore::BitmapImageSingleFrameSkia::destroyDecodedData):
(WebCore::BitmapImageSingleFrameSkia::decodedSize):
(WebCore::BitmapImageSingleFrameSkia::nativeImageForCurrentFrame):
(WebCore::BitmapImageSingleFrameSkia::notSolidColor):
* platform/graphics/skia/BitmapImageSingleFrameSkia.h:
(BitmapImageSingleFrameSkia):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@111572 268f45cc-cd09-0410-ab3c-d52691b4dbfc