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

gpu/demos/framework/window.cc

Index: gpu/demos/framework/window.cc
===================================================================
--- gpu/demos/framework/window.cc	(revision 137438)
+++ gpu/demos/framework/window.cc	(working copy)
@@ -44,7 +44,7 @@
   gles2_cmd_helper_.reset();
 
   if (decoder_.get()) {
-    decoder_->Destroy();
+    decoder_->Destroy(true);
   }
 }
 
@@ -70,7 +70,7 @@
     return false;
   }
 
-  gpu::gles2::ContextGroup::Ref group(new gpu::gles2::ContextGroup(true));
+  gpu::gles2::ContextGroup::Ref group(new gpu::gles2::ContextGroup(NULL, true));
 
   decoder_.reset(gpu::gles2::GLES2Decoder::Create(group.get()));
   if (!decoder_.get())
@@ -91,6 +91,8 @@
   if (!context_.get())
     return false;
 
+  context_->MakeCurrent(surface_);
+
   std::vector<int32> attribs;
   if (!decoder_->Initialize(surface_.get(),
                             context_.get(),