Improve NVPR stroke accuracy to fix thick strokes

src/gpu/gl/GrGLDefines.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 GrGLDefines_DEFINED
@@ skipping 820 matching lines @@
 #define GR_GL_LINE_TO                                       0x04
 #define GR_GL_QUADRATIC_CURVE_TO                            0x0A
 #define GR_GL_CUBIC_CURVE_TO                                0x0C
 #define GR_GL_CONIC_CURVE_TO                                0x1A
 
 // path parameters
 #define GR_GL_PATH_STROKE_WIDTH                             0x9075
 #define GR_GL_PATH_END_CAPS                                 0x9076
 #define GR_GL_PATH_JOIN_STYLE                               0x9079
 #define GR_GL_PATH_MITER_LIMIT                              0x907A
+#define GR_GL_PATH_STROKE_BOUND                             0x9086
 
 // fill modes
 #define GR_GL_COUNT_UP                                      0x9088
 
 // cover mode
 #define GR_GL_BOUNDING_BOX                                  0x908D
 #define GR_GL_BOUNDING_BOX_OF_BOUNDING_BOXES                0x909C
 
 // transform type
 #define GR_GL_TRANSLATE_X                                   0x908E
@@ skipping 21 matching lines @@
 // NV_path_rendering extension to EXT_direct_state_access:
 // [the matrix functions] must support the PATH_PROJECTION_NV and
 // PATH_MODELVIEW_NV tokens for matrixMode.
 #define GR_GL_PATH_PROJECTION                               0x1701
 #define GR_GL_PATH_MODELVIEW                                0x1700
 
 /*  ARM specific define for MSAA support on framebuffer fetch */
 #define GR_GL_FETCH_PER_SAMPLE_ARM                          0x8F65
 
 #endif