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This patch implements a generic way of mapping Java Bitmap Config to SkBitmap::Config.
And we use this API by providing GetScaledContentBitmap with a extra config parameter.
It helps in passing the Bitmap.Config.Format from java directly to native, where we can
directly get the SkBitmap::Config.

BUG=342822

Review URL: https://codereview.chromium.org/157033007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253552 0039d316-1c4b-4281-b951-d872f2087c98