blimp: Set up the CompositorDependencies for blimp in Chrome.

blimp/client/support/compositor/blimp_context_provider.cc

 // Copyright 2015 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 "blimp/client/support/compositor/blimp_context_provider.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/lazy_instance.h"
 #include "cc/output/context_cache_controller.h"
@@ skipping 89 matching lines @@
 }
 
 void BlimpContextProvider::InvalidateGrContext(uint32_t state) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
 
   if (gr_context_)
     gr_context_->ResetContext(state);
 }
 
 base::Lock* BlimpContextProvider::GetLock() {
-  // This context provider is not used on multiple threads.
-  NOTREACHED();
-  return nullptr;
+  return &context_lock_;
 }
 
 void BlimpContextProvider::SetLostContextCallback(
     const LostContextCallback& lost_context_callback) {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   lost_context_callback_ = lost_context_callback;
 }
 
 void BlimpContextProvider::OnLostContext() {
   DCHECK(context_thread_checker_.CalledOnValidThread());
   if (!lost_context_callback_.is_null())
     lost_context_callback_.Run();
   if (gr_context_)
     gr_context_->OnLostContext();
 }
 
 }  // namespace client
 }  // namespace blimp