Fixing and enhancing OrderedSimpleTaskRunner to allow 100% deterministic tests.

cc/test/begin_frame_args_test.cc

 // Copyright 2014 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/test/begin_frame_args_test.h"
 
 #include "base/time/time.h"
 #include "cc/output/begin_frame_args.h"
 #include "ui/gfx/frame_time.h"
 
@@ skipping 18 matching lines @@
                                 base::TimeDelta::FromInternalValue(interval));
 }
 
 BeginFrameArgs CreateExpiredBeginFrameArgsForTesting() {
   base::TimeTicks now = gfx::FrameTime::Now();
   return BeginFrameArgs::Create(now,
                                 now - BeginFrameArgs::DefaultInterval(),
                                 BeginFrameArgs::DefaultInterval());
 }
 
+BeginFrameArgs CreateBeginFrameArgsForTesting(
+    scoped_refptr<TestNowSource> now_src) {
+  base::TimeTicks now = now_src->Now();
+  return BeginFrameArgs::Create(now,
+                                now + (BeginFrameArgs::DefaultInterval() / 2),
+                                BeginFrameArgs::DefaultInterval());
+}
+
+BeginFrameArgs CreateExpiredBeginFrameArgsForTesting(
+    scoped_refptr<TestNowSource> now_src) {
+  base::TimeTicks now = now_src->Now();
+  return BeginFrameArgs::Create(now,
+                                now - BeginFrameArgs::DefaultInterval(),
+                                BeginFrameArgs::DefaultInterval());
+}
+
 bool operator==(const BeginFrameArgs& lhs, const BeginFrameArgs& rhs) {
   return (lhs.frame_time == rhs.frame_time) && (lhs.deadline == rhs.deadline) &&
          (lhs.interval == rhs.interval);
 }
 
 ::std::ostream& operator<<(::std::ostream& os, const BeginFrameArgs& args) {
   PrintTo(args, &os);
   return os;
 }
 
 void PrintTo(const BeginFrameArgs& args, ::std::ostream* os) {
   *os << "BeginFrameArgs(" << args.frame_time.ToInternalValue() << ", "
       << args.deadline.ToInternalValue() << ", "
       << args.interval.InMicroseconds() << "us)";
 }
 
 }  // namespace cc