Switch to double for time calculations using playback rate.

media/base/time_delta_interpolator.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 "media/base/time_delta_interpolator.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/time/tick_clock.h"
 #include "media/base/buffers.h"
 
 namespace media {
 
 TimeDeltaInterpolator::TimeDeltaInterpolator(base::TickClock* tick_clock)
     : tick_clock_(tick_clock),
       interpolating_(false),
       upper_bound_(kNoTimestamp()),
-      playback_rate_(1.0f) {
+      playback_rate_(1.0) {
   DCHECK(tick_clock_);
 }
 
 TimeDeltaInterpolator::~TimeDeltaInterpolator() {
 }
 
 base::TimeDelta TimeDeltaInterpolator::StartInterpolating() {
   DCHECK(!interpolating_);
   reference_ = tick_clock_->NowTicks();
   interpolating_ = true;
   return lower_bound_;
 }
 
 base::TimeDelta TimeDeltaInterpolator::StopInterpolating() {
   DCHECK(interpolating_);
   lower_bound_ = GetInterpolatedTime();
   interpolating_ = false;
   return lower_bound_;
 }
 
-void TimeDeltaInterpolator::SetPlaybackRate(float playback_rate) {
+void TimeDeltaInterpolator::SetPlaybackRate(double playback_rate) {
   lower_bound_ = GetInterpolatedTime();
   reference_ = tick_clock_->NowTicks();
   playback_rate_ = playback_rate;
 }
 
 void TimeDeltaInterpolator::SetBounds(base::TimeDelta lower_bound,
                                       base::TimeDelta upper_bound) {
   DCHECK(lower_bound <= upper_bound);
   DCHECK(lower_bound != kNoTimestamp());
 
@@ skipping 19 matching lines @@
   base::TimeDelta interpolated_time =
       lower_bound_ + base::TimeDelta::FromMicroseconds(now_us);
 
   if (upper_bound_ == kNoTimestamp())
     return interpolated_time;
 
   return std::min(interpolated_time, upper_bound_);
 }
 
 }  // namespace media