Allow GLES2CmdDecoder to change the GLSurface associated with the default FBO.

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc
===================================================================
--- webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc	(revision 137438)
+++ webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc	(working copy)
@@ -424,10 +424,16 @@
     return false;
   }
 
+  if (!context_->MakeCurrent(surface_.get())) {
+    LOG(ERROR) << "Could not make context current.";
+    Destroy();
+    return false;
+  }
+
   ::gpu::gles2::DisallowedFeatures disallowed_features;
   disallowed_features.swap_buffer_complete_callback = true;
-  if (!decoder_->Initialize(surface_.get(),
-                            context_.get(),
+  if (!decoder_->Initialize(surface_,
+                            context_,
                             true,
                             size,
                             disallowed_features,