Yield instead of spinning the CPU in CopyOutputSampleDataToPictureBuffer.

content/common/gpu/media/dxva_video_decode_accelerator.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 "content/common/gpu/media/dxva_video_decode_accelerator.h"
 
 #if !defined(OS_WIN)
 #error This file should only be built on Windows.
 #endif   // !defined(OS_WIN)
 
@@ skipping 373 matching lines @@
     hr = device_->StretchRect(dest_surface,
                               NULL,
                               d3d_surface,
                               NULL,
                               D3DTEXF_NONE);
     RETURN_ON_HR_FAILURE(hr, "Colorspace conversion via StretchRect failed",
                          false);
     // Ideally, this should be done immediately before the draw call that uses
     // the texture. Flush it once here though.
     hr = query_->Issue(D3DISSUE_END);
+    RETURN_ON_HR_FAILURE(hr, "Failed to issue END", false);
     do {
       hr = query_->GetData(NULL, 0, D3DGETDATA_FLUSH);
       if (hr == S_FALSE)
-        Sleep(0);
+        Sleep(1);  // Poor-man's Yield().
     } while (hr == S_FALSE);
 
     eglBindTexImage(
         static_cast<EGLDisplay*>(eglGetDisplay(EGL_DEFAULT_DISPLAY)),
         decoding_surface_,
         EGL_BACK_BUFFER);
   } else {
     scoped_array<char> bits;
     RETURN_ON_FAILURE(GetBitmapFromSurface(DXVAVideoDecodeAccelerator::device_,
                                            dest_surface, &bits),
@@ skipping 74 matching lines @@
 
   hr = DXVA2CreateDirect3DDeviceManager9(&dev_manager_reset_token_,
                                          &device_manager_);
   RETURN_ON_HR_FAILURE(hr, "DXVA2CreateDirect3DDeviceManager9 failed", false);
 
   hr = device_manager_->ResetDevice(device_, dev_manager_reset_token_);
   RETURN_ON_HR_FAILURE(hr, "Failed to reset device", false);
 
   hr = device_->CreateQuery(D3DQUERYTYPE_EVENT, &query_);
   RETURN_ON_HR_FAILURE(hr, "Failed to create D3D device query", false);
+  // Ensure query_ API works (to avoid an infinite loop later in
+  // CopyOutputSampleDataToPictureBuffer).
+  hr = query_->Issue(D3DISSUE_END);
+  RETURN_ON_HR_FAILURE(hr, "Failed to issue END test query", false);
 
   return true;
 }
 
 DXVAVideoDecodeAccelerator::DXVAVideoDecodeAccelerator(
     media::VideoDecodeAccelerator::Client* client)
     : client_(client),
       egl_config_(NULL),
       state_(kUninitialized),
       pictures_requested_(false),
@@ skipping 540 matching lines @@
         GL_TEXTURE_2D);
   }
 }
 
 void DXVAVideoDecodeAccelerator::NotifyPictureReady(
     const media::Picture& picture) {
   // This task could execute after the decoder has been torn down.
   if (state_ != kUninitialized && client_)
     client_->PictureReady(picture);
 }