Adding gtest helpers for BeginFrameArgs.

cc/output/begin_frame_args.cc

 // Copyright 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 "base/json/json_writer.h"
 #include "cc/output/begin_frame_args.h"
 #include "ui/gfx/frame_time.h"
 
 namespace cc {
 
@@ skipping 19 matching lines @@
 
 scoped_ptr<base::Value> BeginFrameArgs::AsValue() const {
   scoped_ptr<base::DictionaryValue> state(new base::DictionaryValue);
   state->SetString("type", "BeginFrameArgs");
   state->SetDouble("frame_time_us", frame_time.ToInternalValue());
   state->SetDouble("deadline_us", deadline.ToInternalValue());
   state->SetDouble("interval_us", interval.InMicroseconds());
   return state.PassAs<base::Value>();
 }
 
-BeginFrameArgs BeginFrameArgs::CreateForSynchronousCompositor() {
+BeginFrameArgs BeginFrameArgs::CreateForSynchronousCompositor(
+    base::TimeTicks now) {
   // 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(gfx::FrameTime::Now(),
-                        base::TimeTicks(),
-                        DefaultInterval());
+  if (now.is_null())
+    now = gfx::FrameTime::Now();
+  return BeginFrameArgs(now, base::TimeTicks(), DefaultInterval());
 }
 
 // This is a hard-coded deadline adjustment that assumes 60Hz, to be used in
 // cases where a good estimated draw time is not known. Using 1/3 of the vsync
 // as the default adjustment gives the Browser the last 1/3 of a frame to
 // produce output, the Renderer Impl thread the middle 1/3 of a frame to produce
 // ouput, and the Renderer Main thread the first 1/3 of a frame to produce
 // output.
 base::TimeDelta BeginFrameArgs::DefaultDeadlineAdjustment() {
   return base::TimeDelta::FromMicroseconds(-16666 / 3);
 }
 
 base::TimeDelta BeginFrameArgs::DefaultInterval() {
   return base::TimeDelta::FromMicroseconds(16666);
 }
 
 base::TimeDelta BeginFrameArgs::DefaultRetroactiveBeginFramePeriod() {
   return base::TimeDelta::FromMicroseconds(4444);
 }
 
 }  // namespace cc