Add a factory and defines for native Linux surfaces.

ui/gl/gl_surface.h

Index: ui/gl/gl_surface.h
diff --git a/ui/gl/gl_surface.h b/ui/gl/gl_surface.h
index a8825a58c5a4a1af229047342862c6f746b9fe7a..52e1f2af108b8c33ddebc17690cca7f62191e801 100644
--- a/ui/gl/gl_surface.h
+++ b/ui/gl/gl_surface.h
@@ -30,6 +30,10 @@ class GL_EXPORT GLSurface : public base::RefCounted<GLSurface> {
   // classes is in a pending changelist.
   virtual bool Initialize();
 
+  // Identical to Initialize but using the provided VSyncProvider if the surface
+  // type (EGL only at present) supports an injected VSyncProvider instance.
+  virtual bool Initialize(VSyncProvider* syncProvider);

[piman, 2013/05/18 01:47:19]

Could we move this to the NativeViewGLSurfaceEGL constructor? From the usage
pattern, it looks ok to do, and that way we won't need to leak this into the
cross-platform interface.

[rjkroege, 2013/05/21 17:36:28]

Done.

+
   // Destroys the surface.
   virtual void Destroy() = 0;