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 909cabe2737ce8aef5efae2d2d0433c67f508a4b..0538e0a9ecf6cdcc5137644cb3e06a2f00114e97 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
+++ b/webkit/gpu/webgraphicscontext3d_in_process_impl.cc
@@ -565,6 +565,9 @@ void WebGraphicsContext3DInProcessImpl::reshape(int width, int height) {
 #endif  // FLIP_FRAMEBUFFER_VERTICALLY
 }
 
+void WebGraphicsContext3DInProcessImpl::setVisibility(bool visible) {
+}
+
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
 void WebGraphicsContext3DInProcessImpl::FlipVertically(
     unsigned char* framebuffer, unsigned int width, unsigned int height) {