cc: Unify use of DidSwapBuffers() and did_request_swap

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 0d34f036c5831f0525f250c9c51c287223c24f87..f77b40ee7c356510df989e5bdca051fddbe66039 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -30,9 +30,9 @@ class SchedulerClient {
   virtual void SetNeedsBeginFrame(bool enable) = 0;
   virtual void WillBeginImplFrame(const BeginFrameArgs& args) = 0;
   virtual void ScheduledActionSendBeginMainFrame() = 0;
-  virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapIfPossible() = 0;
-  virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() = 0;
-  virtual DrawSwapReadbackResult ScheduledActionDrawAndReadback() = 0;
+  virtual DrawResult ScheduledActionDrawAndSwapIfPossible() = 0;
+  virtual DrawResult ScheduledActionDrawAndSwapForced() = 0;
+  virtual DrawResult ScheduledActionDrawAndReadback() = 0;
   virtual void ScheduledActionCommit() = 0;
   virtual void ScheduledActionUpdateVisibleTiles() = 0;
   virtual void ScheduledActionActivatePendingTree() = 0;