cc: Only make num_threads - 1 SkPicture clones.

cc/resources/pixel_buffer_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/pixel_buffer_raster_worker_pool.h"
 
 #include "base/containers/stack_container.h"
 #include "base/debug/trace_event.h"
 #include "base/values.h"
 #include "cc/debug/traced_value.h"
 #include "cc/resources/resource.h"
 
 namespace cc {
 namespace {
 
 const int kCheckForCompletedRasterTasksDelayMs = 6;
 
 const size_t kMaxScheduledRasterTasks = 48;
 
 typedef base::StackVector<internal::WorkerPoolTask*, kMaxScheduledRasterTasks>
     WorkerPoolTaskVector;
 
 // Only used as std::find_if predicate for DCHECKs.
 bool WasCanceled(const internal::RasterWorkerPoolTask* task) {
   return !task->HasFinishedRunning();
 }
 
-class RasterTaskGraphRunner : public internal::TaskGraphRunner {
- public:
-  RasterTaskGraphRunner()
-      : internal::TaskGraphRunner(RasterWorkerPool::GetNumRasterThreads(),
-                                  "CompositorRaster") {}
-};
-base::LazyInstance<RasterTaskGraphRunner>::Leaky g_task_graph_runner =
-    LAZY_INSTANCE_INITIALIZER;
-
 }  // namespace
 
 // static
 scoped_ptr<RasterWorkerPool> PixelBufferRasterWorkerPool::Create(
     ResourceProvider* resource_provider,
     ContextProvider* context_provider,
     size_t max_transfer_buffer_usage_bytes) {
   return make_scoped_ptr<RasterWorkerPool>(
-      new PixelBufferRasterWorkerPool(g_task_graph_runner.Pointer(),
+      new PixelBufferRasterWorkerPool(GetTaskGraphRunner(),
                                       resource_provider,
                                       context_provider,
                                       max_transfer_buffer_usage_bytes));
 }
 
 PixelBufferRasterWorkerPool::PixelBufferRasterWorkerPool(
     internal::TaskGraphRunner* task_graph_runner,
     ResourceProvider* resource_provider,
     ContextProvider* context_provider,
     size_t max_transfer_buffer_usage_bytes)
@@ skipping 649 matching lines @@
 
   throttle_state->SetInteger("bytes_available_for_upload",
                              max_bytes_pending_upload_ - bytes_pending_upload_);
   throttle_state->SetInteger("bytes_pending_upload", bytes_pending_upload_);
   throttle_state->SetInteger("scheduled_raster_task_count",
                              scheduled_raster_task_count_);
   return throttle_state.PassAs<base::Value>();
 }
 
 }  // namespace cc