Correct BackingStoreMac::CopyFromBackingStore coordinates on Mac
Correct BackingStoreMac::CopyFromBackingStore coordinates on Mac

When Chrome is running in non-composited mode it is observed that
NTP thumbnails has a strange black strip on the left. This is because
BackingStoreMac::CopyFromBackingStore uses incorrect coordinates
for drawing.

|rect| is the source rect but is used as a destination rect, hence
the image is shifted in the opposite X direction.

BUG=160226
TEST=Run chrome with --disable-accelerated-compositing and try 
     www.google.com to generate NTP thumbnail. It should have no
     visual artifacts.


Review URL: https://chromiumcodereview.appspot.com/12091116

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@181206 0039d316-1c4b-4281-b951-d872f2087c98

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