Add support for glMapBufferRange. Use glMapBufferRange and glMapBufferSubData.

include/gpu/gl/GrGLInterface.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLInterface_DEFINED
 #define GrGLInterface_DEFINED
 
@@ skipping 174 matching lines @@
         GLPtr<GrGLDisableVertexAttribArrayProc> fDisableVertexAttribArray;
         GLPtr<GrGLDrawArraysProc> fDrawArrays;
         GLPtr<GrGLDrawBufferProc> fDrawBuffer;
         GLPtr<GrGLDrawBuffersProc> fDrawBuffers;
         GLPtr<GrGLDrawElementsProc> fDrawElements;
         GLPtr<GrGLEnableProc> fEnable;
         GLPtr<GrGLEnableVertexAttribArrayProc> fEnableVertexAttribArray;
         GLPtr<GrGLEndQueryProc> fEndQuery;
         GLPtr<GrGLFinishProc> fFinish;
         GLPtr<GrGLFlushProc> fFlush;
+        GLPtr<GrGLFlushMappedBufferRangeProc> fFlushMappedBufferRange;
         GLPtr<GrGLFramebufferRenderbufferProc> fFramebufferRenderbuffer;
         GLPtr<GrGLFramebufferTexture2DProc> fFramebufferTexture2D;
         GLPtr<GrGLFramebufferTexture2DMultisampleProc> fFramebufferTexture2DMultisample;
         GLPtr<GrGLFrontFaceProc> fFrontFace;
         GLPtr<GrGLGenBuffersProc> fGenBuffers;
         GLPtr<GrGLGenFramebuffersProc> fGenFramebuffers;
         GLPtr<GrGLGenerateMipmapProc> fGenerateMipmap;
         GLPtr<GrGLGenQueriesProc> fGenQueries;
         GLPtr<GrGLGenRenderbuffersProc> fGenRenderbuffers;
         GLPtr<GrGLGenTexturesProc> fGenTextures;
@@ skipping 19 matching lines @@
         GLPtr<GrGLInsertEventMarkerProc> fInsertEventMarker;
         GLPtr<GrGLInvalidateBufferDataProc> fInvalidateBufferData;
         GLPtr<GrGLInvalidateBufferSubDataProc> fInvalidateBufferSubData;
         GLPtr<GrGLInvalidateFramebufferProc> fInvalidateFramebuffer;
         GLPtr<GrGLInvalidateSubFramebufferProc> fInvalidateSubFramebuffer;
         GLPtr<GrGLInvalidateTexImageProc> fInvalidateTexImage;
         GLPtr<GrGLInvalidateTexSubImageProc> fInvalidateTexSubImage;
         GLPtr<GrGLLineWidthProc> fLineWidth;
         GLPtr<GrGLLinkProgramProc> fLinkProgram;
         GLPtr<GrGLMapBufferProc> fMapBuffer;
+        GLPtr<GrGLMapBufferRangeProc> fMapBufferRange;
         GLPtr<GrGLMapBufferSubDataProc> fMapBufferSubData;
         GLPtr<GrGLMapTexSubImage2DProc> fMapTexSubImage2D;
         GLPtr<GrGLMatrixLoadfProc> fMatrixLoadf;
         GLPtr<GrGLMatrixLoadIdentityProc> fMatrixLoadIdentity;
         GLPtr<GrGLPixelStoreiProc> fPixelStorei;
         GLPtr<GrGLPopGroupMarkerProc> fPopGroupMarker;
         GLPtr<GrGLPushGroupMarkerProc> fPushGroupMarker;
         GLPtr<GrGLQueryCounterProc> fQueryCounter;
         GLPtr<GrGLReadBufferProc> fReadBuffer;
         GLPtr<GrGLReadPixelsProc> fReadPixels;
@@ skipping 122 matching lines @@
     } fFunctions;
 
     // Per-GL func callback
 #if GR_GL_PER_GL_FUNC_CALLBACK
     GrGLInterfaceCallbackProc fCallback;
     GrGLInterfaceCallbackData fCallbackData;
 #endif
 };
 
 #endif