Increase priority of GPU presenter threads

ui/gfx/surface/accelerated_surface_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/surface/accelerated_surface_win.h"
 
 #include <d3d9.h>
 #include <windows.h>
 
 #include <list>
@@ skipping 305 matching lines @@
       D3DDEVTYPE_HAL,
       window,
       D3DCREATE_FPU_PRESERVE | D3DCREATE_SOFTWARE_VERTEXPROCESSING |
           D3DCREATE_MULTITHREADED,
       &parameters,
       NULL,
       device_.Receive());
   if (FAILED(hr))
     return;
 
+  // Increase the GPU priority of this thread, so the StretchRect to the
+  // backbuffer doesn't have to wait for expensive commands in the GPU process
+  // to execute.
+  device_->SetGPUThreadPriority(7);

[apatrick_chromium, 2012/03/06 22:20:31]

This isn't going to give this thread higher GPU priority than the DWM, thereby
bricking lots of machines is it? :) Does 1 work?

+
   hr = device_->CreateQuery(D3DQUERYTYPE_EVENT, query_.Receive());
   if (FAILED(hr)) {
     device_ = NULL;
     return;
   }
 
   return;
 }
 
 void AcceleratedPresenter::DoResize(const gfx::Size& size) {
@@ skipping 173 matching lines @@
 }
 
 bool AcceleratedSurface::Present(HWND window) {
   return presenter_->Present(window);
 }
 
 void AcceleratedSurface::Suspend() {
   presenter_->Suspend();
 }