Changing Aura background for new temporary one.

As per UX request this CL is changing the background for Aura. Note that this is the first resource which is a JPG. As a result I had to modify the bundle code (which assumes PNGs).
Converting that file to PNG even with all kind of fancy optimization would triple its size.

Note on the PNGCodec, it says in the header:  
"This is currently designed for use in tests only (where we control the files)"
So I investigated using the Skia decoding helper but it seems to be unused and not really working. 

Finally, I am not crazy about having a fallback for the PNG decoding failure like this in the code. I would have preferred testing for the image type (but there was no clean way which was obvious to me, of course we could look at the first few bytes in the header since we have it memory).

BUG=105508
TEST=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=114871

[Emmanuel Saint-loubert-Bié, 2011-12-16 19:17:06]

Hi Scott,

Pleas see my comments in the CL and let me know if you have better ideas.

Meanwhile the new wallpaper is missing because I got this error:
Not uploading the current file for ui/resources/aura/wallpaper.jpg because it's
too large.

But please look at the code in the meantime.

Thanks,

-- Emmanuel

[sky, 2011-12-16 19:27:23]

LGTM

http://codereview.chromium.org/8970032/diff/1/ui/base/resource/resource_bundl...
File ui/base/resource/resource_bundle.cc (right):

http://codereview.chromium.org/8970032/diff/1/ui/base/resource/resource_bundl...
ui/base/resource/resource_bundle.cc:377: SkBitmap *allocated_bitmap =
'SkBitmap *' -> 'SkBitmap* '

[Emmanuel Saint-loubert-Bié, 2011-12-16 21:43:39]

http://codereview.chromium.org/8970032/diff/1/ui/base/resource/resource_bundl...
File ui/base/resource/resource_bundle.cc (right):

http://codereview.chromium.org/8970032/diff/1/ui/base/resource/resource_bundl...
ui/base/resource/resource_bundle.cc:377: SkBitmap *allocated_bitmap =
On 2011/12/16 19:27:23, sky wrote:
> 'SkBitmap *' -> 'SkBitmap* '

Done.