Update TestWindowContext to work with new HWUI ops.
Update TestWindowContext to work with new HWUI ops.

This enables HWUI to be testing within Skia's infrastructure and
fixes skia bug 4775.

Change-Id: I242b9e4c5ed0f4523b6075d8825a2624235a01c7

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base