Add flag bits for partial GrContext reset

include/gpu/GrContext.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 GrContext_DEFINED
@@ skipping 43 matching lines @@
      */
     static int GetThreadInstanceCount();
 
     virtual ~GrContext();
 
     /**
      * The GrContext normally assumes that no outsider is setting state
      * within the underlying 3D API's context/device/whatever. This call informs
      * the context that the state was modified and it should resend. Shouldn't
      * be called frequently for good performance.
+     * The flag bits, state, is dpendent on which backend is used by the
+     * context, either GL or D3D (possible in future).
      */
-    void resetContext();
+    void resetContext(uint32_t state = kAll_GrBackendState);
 
     /**
      * Callback function to allow classes to cleanup on GrContext destruction.
      * The 'info' field is filled in with the 'info' passed to addCleanUp.
      */
     typedef void (*PFCleanUpFunc)(const GrContext* context, void* info);
 
     /**
      * Add a function to be called from within GrContext's destructor.
      * This gives classes a chance to free resources held on a per context basis.
@@ skipping 944 matching lines @@
     }
 
     GrTexture* texture() { return fTexture; }
 
 private:
     GrContext*                    fContext;
     GrTexture*                    fTexture;
 };
 
 #endif