Merge commit 'affd0f8ec31f9bf1f0f2288c5f6ebab9c18673fe' * commit 'affd0f8ec31f9bf1f0f2288c5f6ebab9c18673fe': Update ApiDemos CameraPreview activity to properly center the preview in cases where the camera hardware doesn't support a preview size with the same aspect ratio as the device display.