Decouple cc::FakeWebGraphicsContext3D from blink::WGC3D

cc/resources/raster_worker_pool.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/resources/raster_worker_pool.h"
 
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/values.h"
 #include "cc/debug/devtools_instrumentation.h"
@@ skipping 549 matching lines @@
     internal::RasterWorkerPoolTask* task) const {
   return
       raster_tasks_required_for_activation_.find(task) !=
       raster_tasks_required_for_activation_.end();
 }
 
 void RasterWorkerPool::RunGpuRasterTasks(const RasterTaskVector& tasks) {
   if (tasks.empty())
     return;
 
-  blink::WebGraphicsContext3D* context = context_provider_->Context3d();
-  if (!context->makeContextCurrent())
-    return;
+  context_provider_->MakeGrContextCurrent();
 
   GrContext* gr_context = context_provider_->GrContext();
   // TODO(alokp): Implement TestContextProvider::GrContext().
-  if (gr_context) gr_context->resetContext();
+  if (gr_context)
+    gr_context->resetContext();
 
   for (RasterTaskVector::const_iterator it = tasks.begin();
        it != tasks.end(); ++it) {
     internal::RasterWorkerPoolTask* task = it->get();
     DCHECK(task->use_gpu_rasterization());
 
     task->RunOnOriginThread(resource_provider_, context_provider_);
     task->DidRun(false);
     completed_gpu_raster_tasks_.push_back(task);
   }
 
   // TODO(alokp): Implement TestContextProvider::GrContext().
-  if (gr_context) gr_context->flush();
+  if (gr_context)
+    gr_context->flush();
 }
 
 scoped_refptr<internal::WorkerPoolTask>
     RasterWorkerPool::CreateRasterFinishedTask() {
   return make_scoped_refptr(
       new RasterFinishedWorkerPoolTaskImpl(
           base::Bind(&RasterWorkerPool::OnRasterFinished,
                      weak_ptr_factory_.GetWeakPtr())));
 }
 
@@ skipping 79 matching lines @@
 
     internal::GraphNode* decode_node = CreateGraphNodeForTask(
         decode_task, priority, graph);
     decode_node->add_dependent(raster_node);
   }
 
   return raster_node;
 }
 
 }  // namespace cc