Remove forced commit and readback from the scheduler.

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index aeb5e0b381061a60e14c175906df3cad9a446263..a80d4495485b602126b7bf1c6ed95c18f9aed6fe 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -32,7 +32,6 @@ class SchedulerClient {
   virtual void ScheduledActionSendBeginMainFrame() = 0;
   virtual DrawResult ScheduledActionDrawAndSwapIfPossible() = 0;
   virtual DrawResult ScheduledActionDrawAndSwapForced() = 0;
-  virtual DrawResult ScheduledActionDrawAndReadback() = 0;
   virtual void ScheduledActionAnimate() = 0;
   virtual void ScheduledActionCommit() = 0;
   virtual void ScheduledActionUpdateVisibleTiles() = 0;
@@ -76,10 +75,6 @@ class CC_EXPORT Scheduler {
 
   void SetNeedsCommit();
 
-  // Like SetNeedsCommit(), but ensures a commit will definitely happen even if
-  // we are not visible. Will eventually result in a forced draw internally.
-  void SetNeedsForcedCommitForReadback();
-
   void SetNeedsRedraw();
 
   void SetNeedsAnimate();