cc: Set sync token on resource even if context is lost.

cc/test/test_web_graphics_context_3d.cc

 // Copyright 2013 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 "cc/test/test_web_graphics_context_3d.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 628 matching lines @@
   images.insert(image_id);
   return image_id;
 }
 
 GLuint64 TestWebGraphicsContext3D::insertFenceSync() {
   return next_insert_fence_sync_++;
 }
 
 void TestWebGraphicsContext3D::genSyncToken(GLuint64 fence_sync,
                                             GLbyte* sync_token) {
+  // Don't return a valid sync token if context is lost. This matches behavior
+  // of CommandBufferProxyImpl.
+  if (context_lost_)
+    return;
   gpu::SyncToken sync_token_data(gpu::CommandBufferNamespace::GPU_IO, 0,
                                  gpu::CommandBufferId(), fence_sync);
   sync_token_data.SetVerifyFlush();
   memcpy(sync_token, &sync_token_data, sizeof(sync_token_data));
 }
 
 void TestWebGraphicsContext3D::waitSyncToken(const GLbyte* sync_token) {
   if (sync_token) {
     gpu::SyncToken sync_token_data;
     memcpy(sync_token_data.GetData(), sync_token, sizeof(sync_token_data));
@@ skipping 166 matching lines @@
 
 TestWebGraphicsContext3D::Buffer::Buffer() : target(0), size(0) {}
 
 TestWebGraphicsContext3D::Buffer::~Buffer() {}
 
 TestWebGraphicsContext3D::Image::Image() {}
 
 TestWebGraphicsContext3D::Image::~Image() {}
 
 }  // namespace cc