cc: Heuristic for Renderer latency recovery

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"
 
 namespace cc {
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location) {
   return CreateBeginFrameArgsForTesting(location, gfx::FrameTime::Now());
 }
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location,
     base::TimeTicks frame_time) {
   return BeginFrameArgs::Create(
       location, frame_time,
-      frame_time + (BeginFrameArgs::DefaultInterval() / 2),
+      frame_time + BeginFrameArgs::DefaultInterval() -
+          BeginFrameArgs::DefaultEstimatedParentDrawTime(),

[brianderson, 2015/05/08 16:52:50]

I changed this because the non-zero threshold in
Scheduler::CanDrawBeforeDeadline made it difficult for my unittests to make
CanDrawBeforeDeadline true if the deadline was half way through the frame.

I could have made it work in the tests with really small duration estimates, but
decided to change this instead since it better reflects the BeginFrames we'd get
in production with hard coded deadlines.

       BeginFrameArgs::DefaultInterval(), BeginFrameArgs::NORMAL);
 }
 
 BeginFrameArgs CreateBeginFrameArgsForTesting(
     BeginFrameArgs::CreationLocation location,
     int64 frame_time,
     int64 deadline,
     int64 interval) {
   return BeginFrameArgs::Create(
       location, base::TimeTicks::FromInternalValue(frame_time),
@@ skipping 50 matching lines @@
 }
 
 void PrintTo(const BeginFrameArgs& args, ::std::ostream* os) {
   *os << "BeginFrameArgs(" << BeginFrameArgs::TypeToString(args.type) << ", "
       << args.frame_time.ToInternalValue() << ", "
       << args.deadline.ToInternalValue() << ", "
       << args.interval.InMicroseconds() << "us)";
 }
 
 }  // namespace cc