Bug 968374 - Add pref for enabling privileged extensions for non-chrome code. r=bjacob

content/canvas/src/WebGLContextExtensions.cpp

@@ -53,10 +53,18 @@ WebGLContext::IsExtensionEnabled(WebGLExtensionID ext) const {
 
 bool WebGLContext::IsExtensionSupported(JSContext *cx, WebGLExtensionID ext) const
 {
+    bool allowPrivilegedExts = false;
+
     // Chrome contexts need access to debug information even when
     // webgl.disable-extensions is set. This is used in the graphics
     // section of about:support.
-    if (xpc::AccessCheck::isChrome(js::GetContextCompartment(cx))) {
+    if (xpc::AccessCheck::isChrome(js::GetContextCompartment(cx)))
+        allowPrivilegedExts = true;
+
+    if (Preferences::GetBool("webgl.enable-privileged-extensions", false))
+        allowPrivilegedExts = true;
+
+    if (allowPrivilegedExts) {
         switch (ext) {
             case WEBGL_debug_renderer_info:
                 return true;

modules/libpref/src/init/all.js

@@ -3858,6 +3858,7 @@ pref("webgl.lose-context-on-heap-minimize", false);
 pref("webgl.can-lose-context-in-foreground", true);
 pref("webgl.max-warnings-per-context", 32);
 pref("webgl.enable-draft-extensions", false);
+pref("webgl.enable-privileged-extensions", false);
 #ifdef MOZ_WIDGET_GONK
 pref("gfx.gralloc.fence-with-readpixels", false);
 #endif