Add can-ignore-rect hint to clear call

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 388 matching lines @@
     void drawIndexedInstances(GrPrimitiveType type,
                               int instanceCount,
                               int verticesPerInstance,
                               int indicesPerInstance,
                               const SkRect* devBounds = NULL);
 
     /**
      * Clear the current render target if one isn't passed in. Ignores the
      * clip and all other draw state (blend mode, stages, etc). Clears the
      * whole thing if rect is NULL, otherwise just the rect.
      */

[bsalomon, 2013/10/31 19:09:00]

doc?

[robertphillips, 2013/10/31 21:45:19]

Done.

     virtual void clear(const SkIRect* rect,
                        GrColor color,
+                       bool canIgnoreRect,
                        GrRenderTarget* renderTarget = NULL) = 0;
 
     /**
      * Copies a pixel rectangle from one surface to another. This call may finalize
      * reserved vertex/index data (as though a draw call was made). The src pixels
      * copied are specified by srcRect. They are copied to a rect of the same
      * size in dst with top left at dstPoint. If the src rect is clipped by the
      * src bounds then  pixel values in the dst rect corresponding to area clipped
      * by the src rect are not overwritten. This method can fail and return false
      * depending on the type of surface, configs, etc, and the backend-specific
@@ skipping 453 matching lines @@
     const GrClipData*                                               fClip;
     GrDrawState*                                                    fDrawState;
     GrDrawState                                                     fDefaultDrawState;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by DrawTarget.
     GrContext*                                                      fContext;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif