Type conversion fixes, media/ edition.

media/cast/common/clock_drift_smoother.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/cast/common/clock_drift_smoother.h"
 
 #include "base/logging.h"
 
 namespace media {
 namespace cast {
 
 ClockDriftSmoother::ClockDriftSmoother(base::TimeDelta time_constant)
     : time_constant_(time_constant),
       estimate_us_(0.0) {
   DCHECK(time_constant_ > base::TimeDelta());
 }
 
 ClockDriftSmoother::~ClockDriftSmoother() {}
 
 base::TimeDelta ClockDriftSmoother::Current() const {
   DCHECK(!last_update_time_.is_null());
   return base::TimeDelta::FromMicroseconds(
       static_cast<int64>(estimate_us_ + 0.5));  // Round to nearest microsecond.
 }
 
 void ClockDriftSmoother::Reset(base::TimeTicks now,
                                base::TimeDelta measured_offset) {
   DCHECK(!now.is_null());
   last_update_time_ = now;
-  estimate_us_ = measured_offset.InMicroseconds();
+  estimate_us_ = static_cast<double>(measured_offset.InMicroseconds());
 }
 
 void ClockDriftSmoother::Update(base::TimeTicks now,
                                 base::TimeDelta measured_offset) {
   DCHECK(!now.is_null());
   if (last_update_time_.is_null()) {
     Reset(now, measured_offset);
   } else if (now < last_update_time_) {
     // |now| is not monotonically non-decreasing.
     NOTREACHED();
   } else {
-    const double elapsed_us = (now - last_update_time_).InMicroseconds();
+    const double elapsed_us =
+        static_cast<double>((now - last_update_time_).InMicroseconds());
     last_update_time_ = now;
     const double weight =
         elapsed_us / (elapsed_us + time_constant_.InMicroseconds());
     estimate_us_ = weight * measured_offset.InMicroseconds() +
         (1.0 - weight) * estimate_us_;
   }
 }
 
 // static
 base::TimeDelta ClockDriftSmoother::GetDefaultTimeConstant() {
   static const int kDefaultTimeConstantInSeconds = 30;
   return base::TimeDelta::FromSeconds(kDefaultTimeConstantInSeconds);
 }
 
 }  // namespace cast
 }  // namespace media