Plumb through A8 for GL/EGL

Bug: 193170859
Test: TODO

Change-Id: I45993488808457b9a1ea03e9c4a46253d5b45df0
diff --git a/libs/hwui/renderthread/EglManager.h b/libs/hwui/renderthread/EglManager.h
index 69f3ed0..fc6b28d 100644
--- a/libs/hwui/renderthread/EglManager.h
+++ b/libs/hwui/renderthread/EglManager.h
@@ -89,6 +89,7 @@
     static EGLConfig load8BitsConfig(EGLDisplay display, SwapBehavior swapBehavior);
     static EGLConfig loadFP16Config(EGLDisplay display, SwapBehavior swapBehavior);
     static EGLConfig load1010102Config(EGLDisplay display, SwapBehavior swapBehavior);
+    static EGLConfig loadA8Config(EGLDisplay display, SwapBehavior swapBehavior);
 
     void initExtensions();
     void createPBufferSurface();
@@ -100,6 +101,7 @@
     EGLConfig mEglConfig;
     EGLConfig mEglConfigF16;
     EGLConfig mEglConfig1010102;
+    EGLConfig mEglConfigA8;
     EGLContext mEglContext;
     EGLSurface mPBufferSurface;
     EGLSurface mCurrentSurface;