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A new WebKitClientImpl class is added to webkit/glue that consumers can use to
help implement WebKitClient.  In the future, consumers will likely subclass
WebKitClientImpl.  For now, that is not necessary.

Since a WebImage may not hold a SkBitmap, I needed to modify
ScopedClipboardWriterGlue to not deal in SkBitmaps.  So, I just added a
WriteBitmapFromPixels method in place of the WriteBitmap method.  That method
is actually named the same as the one from the base class, which is perhaps
kind of nice since the purpose of ScopedClipboardWriterGlue is to override the
default way of sending an image to the clipboard!

R=dglazkov

Review URL: http://codereview.chromium.org/28119

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@10416 0039d316-1c4b-4281-b951-d872f2087c98