Add GL_CHROMIUM_map_sub functions to GrGLInterface and bit to GrGLCaps.

include/gpu/gl/GrGLInterface.h

Index: include/gpu/gl/GrGLInterface.h
diff --git a/include/gpu/gl/GrGLInterface.h b/include/gpu/gl/GrGLInterface.h
index c403ce4dffe58318ac9730524f003866c8def3d4..f206c6b9c5c4c02cdf7ae7f84b8fe345b6c014a8 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -233,6 +233,8 @@ public:
         GLPtr<GrGLLoadIdentityProc> fLoadIdentity;
         GLPtr<GrGLLoadMatrixfProc> fLoadMatrixf;
         GLPtr<GrGLMapBufferProc> fMapBuffer;
+        GLPtr<GrGLMapBufferSubDataProc> fMapBufferSubData;
+        GLPtr<GrGLMapTexSubImage2DProc> fMapTexSubImage2D;
         GLPtr<GrGLMatrixModeProc> fMatrixMode;
         GLPtr<GrGLPixelStoreiProc> fPixelStorei;
         GLPtr<GrGLPopGroupMarkerProc> fPopGroupMarker;
@@ -305,6 +307,8 @@ public:
         GLPtr<GrGLUniformMatrix3fvProc> fUniformMatrix3fv;
         GLPtr<GrGLUniformMatrix4fvProc> fUniformMatrix4fv;
         GLPtr<GrGLUnmapBufferProc> fUnmapBuffer;
+        GLPtr<GrGLUnmapBufferSubDataProc> fUnmapBufferSubData;
+        GLPtr<GrGLUnmapTexSubImage2DProc> fUnmapTexSubImage2D;
         GLPtr<GrGLUseProgramProc> fUseProgram;
         GLPtr<GrGLVertexAttrib4fvProc> fVertexAttrib4fv;
         GLPtr<GrGLVertexAttribPointerProc> fVertexAttribPointer;