content: Implement dynamic priorities for raster threads.

cc/raster/task_graph_runner.cc

Index: cc/raster/task_graph_runner.cc
diff --git a/cc/raster/task_graph_runner.cc b/cc/raster/task_graph_runner.cc
index 4f1af43ad43901309131886aa2dd6d5c6de1343a..f3d657d279e928b00d3283c6be760f9a7ddf2698 100644
--- a/cc/raster/task_graph_runner.cc
+++ b/cc/raster/task_graph_runner.cc
@@ -5,6 +5,7 @@
 #include "cc/raster/task_graph_runner.h"
 
 #include <algorithm>
+#include <iomanip>

[prashant.n, 2016/03/11 17:49:35]

Remove.

 #include <utility>
 
 #include "base/atomic_sequence_num.h"
@@ -13,12 +14,23 @@
 
 namespace cc {
 
-Task::Task() : will_run_(false), did_run_(false) {}
+Task::Task() : worker_(nullptr), will_run_(false), did_run_(false) {}
 
 Task::~Task() {
   DCHECK(!will_run_);
 }
 
+void Task::AttachWorker(TaskWorker* worker) {

[prashant.n, 2016/03/11 17:49:35]

AttachTaskWorker/DetachTaskWorker

+  DCHECK(!will_run_);
+  DCHECK(!did_run_);
+  worker_ = worker;
+}
+void Task::DetachWorker() {
+  DCHECK(did_run_);
+  worker_->TaskDone();
+  worker_ = nullptr;
+}
+
 void Task::WillRun() {
   DCHECK(!will_run_);
   DCHECK(!did_run_);