cc: Add BeginFrameArgs

cc/output/begin_frame_args.cc

+// Copyright (c) 2013 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/output/begin_frame_args.h"
+
+namespace cc {
+
+BeginFrameArgs::BeginFrameArgs() {}
+
+BeginFrameArgs::BeginFrameArgs(base::TimeTicks frame_time,
+                               base::TimeTicks deadline,
+                               base::TimeDelta interval)
+  : frame_time_(frame_time), deadline_(deadline), interval_(interval)
+{}
+
+BeginFrameArgs::~BeginFrameArgs() {}
+
+BeginFrameArgs BeginFrameArgs::CreateBeginFrame(base::TimeTicks frame_time,
+                                                base::TimeTicks deadline,
+                                                base::TimeDelta interval) {
+  return BeginFrameArgs(frame_time, deadline, interval);
+}
+
+BeginFrameArgs BeginFrameArgs::CreateBeginFrameForSynchronousCompositor() {
+  // For WebView/SynchronousCompositor, we always want to draw immediately,
+  // so we set the deadline to 0 and guess that the interval is 16 milliseconds.
+  return BeginFrameArgs(base::TimeTicks::Now(),
+                        base::TimeTicks(),
+                        base::TimeDelta::FromMicroseconds(16666));
+}
+
+BeginFrameArgs BeginFrameArgs::CreateBeginFrameForTesting() {
+  base::TimeTicks now = base::TimeTicks::Now();
+  return BeginFrameArgs(now,
+                        now + base::TimeDelta::FromMicroseconds(8888),
+                        base::TimeDelta::FromMicroseconds(16666));
+}
+
+base::TimeDelta BeginFrameArgs::DefaultDeadlineAdjustment() {
+  return base::TimeDelta::FromMicroseconds(-8888);
+}
+
+}  // namespace cc