Move GPUFeatureChecker to content layer

chrome/browser/gpu/gpu_feature_checker.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 "chrome/browser/gpu/gpu_feature_checker.h"
-
-#include "base/logging.h"
-#include "build/build_config.h"
-#include "content/public/browser/browser_thread.h"
-#include "content/public/browser/gpu_data_manager.h"
-
-namespace {
-
-// A false return value is always valid, but a true one is only valid if full
-// GPU info has been collected in a GPU process.
-bool IsFeatureAllowed(content::GpuDataManager* manager,
-                      gpu::GpuFeatureType feature) {
-  return (manager->GpuAccessAllowed(NULL) &&
-          !manager->IsFeatureBlacklisted(feature));
-}
-
-}  // namespace
-
-GPUFeatureChecker::GPUFeatureChecker(gpu::GpuFeatureType feature,
-                                     FeatureAvailableCallback callback)
-    : feature_(feature),
-      callback_(callback) {
-}
-
-GPUFeatureChecker::~GPUFeatureChecker() {
-}
-
-void GPUFeatureChecker::CheckGPUFeatureAvailability() {
-  CHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-
-  bool finalized = true;
-#if defined(OS_LINUX)
-  // On Windows and Mac, so far we can always make the final WebGL blacklisting
-  // decision based on partial GPU info; on Linux, we need to launch the GPU
-  // process to collect full GPU info and make the final decision.
-  finalized = false;
-#endif
-
-  content::GpuDataManager* manager = content::GpuDataManager::GetInstance();
-  if (manager->IsEssentialGpuInfoAvailable())
-    finalized = true;
-
-  bool feature_allowed = IsFeatureAllowed(manager, feature_);
-  if (!feature_allowed)
-    finalized = true;
-
-  if (finalized) {
-    callback_.Run(feature_allowed);
-  } else {
-    // Matched with a Release in OnGpuInfoUpdate.
-    AddRef();
-
-    manager->AddObserver(this);
-    manager->RequestCompleteGpuInfoIfNeeded();
-  }
-}
-
-void GPUFeatureChecker::OnGpuInfoUpdate() {
-  content::GpuDataManager* manager = content::GpuDataManager::GetInstance();
-  manager->RemoveObserver(this);
-  bool feature_allowed = IsFeatureAllowed(manager, feature_);
-  callback_.Run(feature_allowed);
-
-  // Matches the AddRef in HasFeature().
-  Release();
-}