Merge commit 'd901f89d79e9b9da8b603079bf549589e83ee8c2' into HEAD

* commit 'd901f89d79e9b9da8b603079bf549589e83ee8c2':
  Add one more clean step to make sure people rebuild webcore for xpath change.
  Enable XPATH in Android browser.
  Performance improvements in GraphicsLayer: implement the simple image code path.
  Revert previous CL due to side-effect. Bug:2600918
  Remove the TouchStationary state from PlatformTouchPoint.
  add portable bzero interface
  In Android, as we always remap the plugin from page space to view space, we do want to update when the rect in the page space changed. This should fix the bug where the plugin is inside a fixed position. So even its page coordinate changed when scrolling, its window coordinate didn't change. We missed the update.
  correct rgba order for skia
  Add checks to consider a fixed layer for compositing only if its dimensions are actually more than zero.
  Cherry-picks WebKit change 56105 to eliminate use of bzero in WebKit common code

Conflicts:
	CleanSpec.mk
Update to use system/core/include 4.2.2_r1.2
Update to use binary.mk 4.3_r2.1