Revert of cc: Remove WorkerPool class and instead use TaskGraphRunner directly.

cc/resources/raster_worker_pool_perftest.cc

Index: cc/resources/raster_worker_pool_perftest.cc
diff --git a/cc/resources/raster_worker_pool_perftest.cc b/cc/resources/raster_worker_pool_perftest.cc
index 840a22af16e71e8f38384aa13edaba6cf270fc06..823c6d656816dbe15c98c38301a103ac770a6cd9 100644
--- a/cc/resources/raster_worker_pool_perftest.cc
+++ b/cc/resources/raster_worker_pool_perftest.cc
@@ -8,7 +8,6 @@
 #include "cc/test/lap_timer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/perf/perf_test.h"
-#include "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
@@ -20,10 +19,8 @@
 
 class PerfWorkerPoolTaskImpl : public internal::WorkerPoolTask {
  public:
-  // Overridden from internal::Task:
+  // Overridden from internal::WorkerPoolTask:
   virtual void RunOnWorkerThread(unsigned thread_index) OVERRIDE {}
-
-  // Overridden from internal::WorkerPoolTask:
   virtual void CompleteOnOriginThread() OVERRIDE {}
 
  private:
@@ -43,7 +40,7 @@
   virtual void ScheduleTasks(RasterTask::Queue* queue) OVERRIDE {
     NOTREACHED();
   }
-  virtual unsigned GetResourceTarget() const OVERRIDE {
+  virtual GLenum GetResourceTarget() const OVERRIDE {
     NOTREACHED();
     return GL_TEXTURE_2D;
   }