cc: Use gpu raster in HUD.

cc/output/context_provider.cc

 // Copyright (c) 2016 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/output/context_provider.h"
 
 namespace cc {
 
 ContextProvider::ScopedContextLock::ScopedContextLock(
     ContextProvider* context_provider)
     : context_provider_(context_provider),
       context_lock_(*context_provider_->GetLock()) {
   // Allow current thread to use |context_provider_|.
   context_provider_->DetachFromThread();
   busy_ = context_provider_->CacheController()->ClientBecameBusy();
 }
 
 ContextProvider::ScopedContextLock::~ScopedContextLock() {
   // Let ContextCacheController know we are no longer busy.
   context_provider_->CacheController()->ClientBecameNotBusy(std::move(busy_));
 
   // Allow usage by thread for which |context_provider_| is bound to.
   context_provider_->DetachFromThread();
 }
 
+ContextProvider::ScopedContext::ScopedContext(ContextProvider* context_provider)
+    : context_provider_(context_provider) {
+  // Allow current thread to use |context_provider_|.
+  context_provider_->DetachFromThread();
+  busy_ = context_provider_->CacheController()->ClientBecameBusy();
+}
+
+ContextProvider::ScopedContext::~ScopedContext() {
+  // Let ContextCacheController know we are no longer busy.
+  context_provider_->CacheController()->ClientBecameNotBusy(std::move(busy_));
+
+  // Allow usage by thread for which |context_provider_| is bound to.
+  context_provider_->DetachFromThread();
+}
+
 }  // namespace cc