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

include/gpu/gl/GrGLExtensions.h

Index: include/gpu/gl/GrGLExtensions.h
diff --git a/include/gpu/gl/GrGLExtensions.h b/include/gpu/gl/GrGLExtensions.h
index c9f59a2702dfed7a3b3a32f3d4641f2e928b835c..76516cf11f9fff31a7b1044c46aeb65e9fc9d1bb 100644
--- a/include/gpu/gl/GrGLExtensions.h
+++ b/include/gpu/gl/GrGLExtensions.h
@@ -19,12 +19,17 @@ struct GrGLInterface;
  * queried. It supports both glGetString- and glGetStringi-style extension string APIs and will
  * use the latter if it is available.
  */
-class GrGLExtensions : public SkNoncopyable {
+class GrGLExtensions {
 public:
     GrGLExtensions() : fInitialized(false), fStrings(SkNEW(SkTArray<SkString>)) {}
 
+    GrGLExtensions(const GrGLExtensions&);
+
+    GrGLExtensions& operator=(const GrGLExtensions&);
+
     void swap(GrGLExtensions* that) {
         fStrings.swap(&that->fStrings);
+        SkTSwap(fInitialized, that->fInitialized);
     }
 
     /**
@@ -42,7 +47,12 @@ public:
     /**
      * Queries whether an extension is present. This will fail if init() has not been called.
      */
-    bool has(const char*) const;
+    bool has(const char[]) const;
+
+    /**
+     * Removes an extension if present. Returns true if the extension was present before the call.
+     */
+    bool remove(const char[]);
 
     void reset() { fStrings->reset(); }