Add a base class for GrIODB that handles geometry data

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 561 matching lines @@
         int                     fVerticesPerInstance;
         int                     fIndicesPerInstance;
 
         SkRect                  fDevBoundsStorage;
         SkRect*                 fDevBounds;
 
         GrPendingIOResource<const GrVertexBuffer, kRead_GrIOType> fVertexBuffer;
         GrPendingIOResource<const GrIndexBuffer, kRead_GrIOType>  fIndexBuffer;
     };
 
-    virtual void setDrawBuffers(DrawInfo*) = 0;;
+    /**
+     * Used to populate the vertex and index buffer on the draw info before onDraw is called.
+     */
+    virtual void setDrawBuffers(DrawInfo*, size_t vertexStride) = 0;;
     bool programUnitTest(int maxStages);
 
 protected:
     enum GeometrySrcType {
         kNone_GeometrySrcType,     //<! src has not been specified
         kReserved_GeometrySrcType, //<! src was set using reserve*Space
         kBuffer_GeometrySrcType    //<! src was set using set*SourceToBuffer
     };
 
     struct GeometrySrcState {
@@ skipping 240 matching lines @@
     virtual bool setupClip(const SkRect* devBounds,
                            GrDrawState::AutoRestoreEffects* are,
                            GrDrawState::AutoRestoreStencil* ars,
                            GrDrawState*,
                            GrClipMaskManager::ScissorState* scissorState) SK_OVERRIDE;
 
     typedef GrDrawTarget INHERITED;
 };
 
 #endif