Revert of Remove gpu support for willUseHWAALines.

src/gpu/GrDrawTarget.h

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawTarget_DEFINED
 #define GrDrawTarget_DEFINED
 
@@ skipping 95 matching lines @@
     /** When we're using coverage AA but the blend is incompatible (given gpu
      * limitations) we should disable AA. */
     bool shouldDisableCoverageAAForBlend() {
         // Enable below if we should draw with AA even when it produces
         // incorrect blending.
         // return false;
         return !this->canApplyCoverage();
     }
 
     /**
+     * Given the current draw state and hw support, will HW AA lines be used (if
+     * a line primitive type is drawn)?
+     */
+    bool willUseHWAALines() const;
+
+    /**
      * There are three types of "sources" of geometry (vertices and indices) for
      * draw calls made on the target. When performing an indexed draw, the
      * indices and vertices can use different source types. Once a source is
      * specified it can be used for multiple draws. However, the time at which
      * the geometry data is no longer editable depends on the source type.
      *
      * Sometimes it is necessary to perform a draw while upstack code has
      * already specified geometry that it isn't finished with. So there are push
      * and pop methods. This allows the client to push the sources, draw
      * something using alternate sources, and then pop to restore the original
@@ skipping 854 matching lines @@
     GrContext*                                                      fContext;
     // To keep track that we always have at least as many debug marker adds as removes
     int                                                             fGpuTraceMarkerCount;
     GrTraceMarkerSet                                                fActiveTraceMarkers;
     GrTraceMarkerSet                                                fStoredTraceMarkers;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif