Bug 764578 - WebGL context creation keeps failing after D3D device has been lost - r=jgilbert

gfx/gl/GLContextProviderEGL.cpp

@@ -2134,10 +2134,19 @@ GLContextProviderEGL::CreateForNativePixmapSurface(gfxASurface* aSurface)
 GLContext *
 GLContextProviderEGL::GetGlobalContext(const ContextFlags)
 {
+// Don't want a global context on Android as 1) share groups across 2 threads fail on many Tegra drivers (bug 759225)
+// and 2) some mobile devices have a very strict limit on global number of GL contexts (bug 754257)
 #ifdef MOZ_JAVA_COMPOSITOR
     return nsnull;
 #endif
 
+// Don't want a global context on Windows as we don't use it for WebGL surface sharing and it makes
+// context creation fail after a context loss (bug 764578)
+#ifdef XP_WIN
+    return nsnull;
+#endif
+
+
     static bool triedToCreateContext = false;
     if (!triedToCreateContext && !gGlobalContext) {
         triedToCreateContext = true;