Turn NVPR on by default (but off in tools).

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 cd7c6bdf60db0211afcf87804875eb3cb5dd0b8c..f5bcd16682a993d9e174785f7c8bf958fd375ad3 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -72,7 +72,11 @@ typedef void (*GrGLInterfaceCallbackProc)(const GrGLInterface*);
 typedef intptr_t GrGLInterfaceCallbackData;
 #endif
 
-/*
+/** Function that returns a new interface identical to "interface" but without support for
+    GL_NV_path_rendering. */
+const GrGLInterface* GrGLInterfaceRemoveNVPR(const GrGLInterface*);
+
+/**
  * GrContext uses the following interface to make all calls into OpenGL. When a
  * GrContext is created it is given a GrGLInterface. The interface's function
  * pointers must be valid for the OpenGL context associated with the GrContext.
@@ -112,6 +116,8 @@ public:
 
     GrGLInterface();
 
+    static GrGLInterface* NewClone(const GrGLInterface*);
+
     // Validates that the GrGLInterface supports its advertised standard. This means the necessary
     // function pointers have been initialized for both the GL version and any advertised
     // extensions.
@@ -358,7 +364,6 @@ public:
         GLPtr<GrGLPointAlongPathProc> fPointAlongPath;
     } fFunctions;
 
-
     // Temporary workaround aliases to keep Chromium GrGLInterface factories compiling until they
     // assign the members of fFunctions.
     GLPtrAlias<GrGLActiveTextureProc> fActiveTexture;