Unify extensions parsing behavior

Removes remnants of EGL extension support, and persistence of
GL extension list.

Change-Id: I35aec12d900bdb33549ea47654bb8146f350ef48
diff --git a/libs/hwui/Android.mk b/libs/hwui/Android.mk
index 3eb13ab..cc0943f 100644
--- a/libs/hwui/Android.mk
+++ b/libs/hwui/Android.mk
@@ -24,6 +24,7 @@
     utils/GLUtils.cpp \
     utils/LinearAllocator.cpp \
     utils/NinePatchImpl.cpp \
+    utils/StringUtils.cpp \
     AmbientShadow.cpp \
     AnimationContext.cpp \
     Animator.cpp \
@@ -168,7 +169,8 @@
     unit_tests/CanvasStateTests.cpp \
     unit_tests/ClipAreaTests.cpp \
     unit_tests/DamageAccumulatorTests.cpp \
-    unit_tests/LinearAllocatorTests.cpp
+    unit_tests/LinearAllocatorTests.cpp \
+    unit_tests/StringUtilsTests.cpp
 
 include $(BUILD_NATIVE_TEST)