Command to mark surface inactive, so gpu process can release resources.

webkit/gpu/webgraphicscontext3d_in_process_impl.cc

Index: webkit/gpu/webgraphicscontext3d_in_process_impl.cc
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
index 450628914ade83b4f728ecbd34e401c3186fe7b3..5da8bd6cbb158ef018df92e5614435a1d09ff6be 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
@@ -588,6 +588,9 @@ void WebGraphicsContext3DInProcessImpl::ClearRenderTarget() {
     glDisable(GL_DITHER);
 }
 
+void WebGraphicsContext3DInProcessImpl::setVisibility(bool visible) {
+}
+
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
 void WebGraphicsContext3DInProcessImpl::FlipVertically(
     unsigned char* framebuffer, unsigned int width, unsigned int height) {