Force GPU switch with CGLSetVirtualScreen only for compositor

gpu/command_buffer/service/gl_context_virtual.cc

Index: gpu/command_buffer/service/gl_context_virtual.cc
diff --git a/gpu/command_buffer/service/gl_context_virtual.cc b/gpu/command_buffer/service/gl_context_virtual.cc
index 5503a94b76307c974910d7e1ae3133b46ab9eac6..bc8c820f28c34fb3e9bc70b6054d00261fb5cbfd 100644
--- a/gpu/command_buffer/service/gl_context_virtual.cc
+++ b/gpu/command_buffer/service/gl_context_virtual.cc
@@ -92,6 +92,13 @@ bool GLContextVirtual::GetTotalGpuMemory(size_t* bytes) {
   return shared_context_->GetTotalGpuMemory(bytes);
 }
 
+void GLContextVirtual::SetSafeToForceGpuSwitch() {
+  // TODO(ccameron): This will not work if two contexts that disagree
+  // about whether or not forced gpu switching may be done both share
+  // the same underlying shared_context_.
+  return shared_context_->SetSafeToForceGpuSwitch();
+}
+
 bool GLContextVirtual::WasAllocatedUsingRobustnessExtension() {
   return shared_context_->WasAllocatedUsingRobustnessExtension();
 }