Revert of Remove gpu support for willUseHWAALines.

src/gpu/gl/GrGpuGL.h

Index: src/gpu/gl/GrGpuGL.h
diff --git a/src/gpu/gl/GrGpuGL.h b/src/gpu/gl/GrGpuGL.h
index 3d84188b1924e81573a86a94890bac1cec780fd6..a8a9727b32160faf984f5b8c1da155418a9434e8 100644
--- a/src/gpu/gl/GrGpuGL.h
+++ b/src/gpu/gl/GrGpuGL.h
@@ -443,7 +443,15 @@
         }
     } fHWBlendState;
 
-    TriState                    fMSAAEnabled;
+    struct {
+        TriState fMSAAEnabled;
+        TriState fSmoothLineEnabled;
+        void invalidate() {
+            fMSAAEnabled = kUnknown_TriState;
+            fSmoothLineEnabled = kUnknown_TriState;
+        }
+    } fHWAAState;
+
 
     GrGLProgram::MatrixState    fHWProjectionMatrixState;