Fix some extract subset bugs.

In SkBitmap::extractSubset, perform a deepCopy, if the pixelRef supports it.

Fixes a bug in the 'extractbitmap' gm, which attempts to draw a subset of a texture backed bitmap (if the canvas is really an SkGpuCanvas).

Also fix some bugs that happen when there is a pixel offset. These fixes get bypassed by the deepCopy, but a user can still set a pixel offset manually.

When copying GPU backed bitmap with a pixel offset, copy the offset.

If the new config is the same as the old, copy fRowBytes as well.

Add a function to SkBitmap.cpp (getUpperLeftFromOffset) to find the x,y coordinate to use when copying to a new config.

Fix a bug where readPixels copied to the correct desired config and we were setting the generation ID to match even though the desired config was not the same as the original config (caught by my new tests!).

Add some tests to verify the correct behavior.

Review URL: https://codereview.appspot.com/6839043

git-svn-id: http://skia.googlecode.com/svn/trunk@6710 2bbb7eff-a529-9590-31e7-b0007b416f81

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