Started working on gradient opacity test for new mapper

Change-Id: I12a4edc644044acae591a4afb8907745f2d7baf0
Added new gradient opacity test

Change-Id: Ibeb2a589e0bd85fb3b31cfdbc26a568bb9a2e138
Test the new mapper for gradient opacity support

Change-Id: I73158e89943e8f991b08c14d62e6df24887ef6de
BUG: Fix an issue in the shader code that supports gradient opacity

Change-Id: I1db36cdc79ccf3b890e4018c5ae3c249f3eb10d6
Pre-compute gradient function to reduce computation overhead

Change-Id: I111ae78f4b71e8f3b95d729da6e1825f00dfe0bf
Merge topic 'gradient_opacity_test' into master

53bb2e0b Pre-compute gradient function to reduce computation overhead
a930c1ce BUG: Fix an issue in the shader code that supports gradient opacity
f85cec93 Test the new mapper for gradient opacity support
6b290237 Added new gradient opacity test
dde316b6 Started working on gradient opacity test for new mapper