Sync with the latest libwebp version (0.2.0-rc1)

Change-Id: I15398a74aaec35cf235247d8e21ad9d9910772b8
Updated WebP with head change#I3da2063b

Fixes for RGBA4444 color mode w.r.t fancy upsampling and
4 bit clipping logic.

Change-Id: Ib6e58bcdb9de3713d5b874d7660c5734c9a3b104
am 5a504147: (-s ours) DO NOT MERGE Sync libwebp ver 0.2.0

* commit '5a50414796e9a458925c7a13a15055d02406bf43':
  DO NOT MERGE Sync libwebp ver 0.2.0
Bring in fix for Chrome's 157079.

The upstream fix is at https://chromiumcodereview.appspot.com/11229048

Change-Id: I98a7c55e4fe01f679233df1ad2316f0f7833c923
Sync libwebp with head#I6ecefe33

Also added ARM/NEON code for decoder/encoder modules.

Change-Id: Ic8028037c94c1191c193d881b799a961b476138e
Revert "Sync libwebp with head#I6ecefe33"

This reverts commit 4b2196c929b70f2cdc1c2556580d349db89356d8

Change-Id: I3c026866c336663666cb5a2e9e34ecffd1f05595
Sync-patch with libwebp (ChangeId: Ia5475247)

Added 16bit swapping of RGB565 / RGB4444 colorspace.
Added ARM/NEON code for decoder/encoder modules.
Speedup in WebP compression (method 3 and above).

Change-Id: I95a697338bef7c3ea08054eb5f850a97d1889eb9
Merge tag 'android-4.3_r2.2' into jellybean-mr2.1

Android 4.3 release 2.2