Mac Video Capture: correct float framerate wrongly casted to int

media/video/capture/mac/video_capture_device_mac.mm

 // Copyright (c) 2012 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/video/capture/mac/video_capture_device_mac.h"
 
 #include <IOKit/IOCFPlugIn.h>
 #include <IOKit/usb/IOUSBLib.h>
 #include <IOKit/usb/USBSpec.h>
 
@@ skipping 352 matching lines @@
 
 void VideoCaptureDeviceMac::AllocateAndStart(
     const VideoCaptureParams& params,
     scoped_ptr<VideoCaptureDevice::Client> client) {
   DCHECK(task_runner_->BelongsToCurrentThread());
   if (state_ != kIdle) {
     return;
   }
   int width = params.requested_format.frame_size.width();
   int height = params.requested_format.frame_size.height();
-  int frame_rate = params.requested_format.frame_rate;
+  float frame_rate = params.requested_format.frame_rate;
 
   // QTKit API can scale captured frame to any size requested, which would lead
   // to undesired aspect ratio changes. Try to open the camera with a known
   // supported format and let the client crop/pad the captured frames.
   if (!AVFoundationGlue::IsAVFoundationSupported())
     GetBestMatchSupportedResolution(&width, &height);
 
   client_ = client.Pass();
   if (device_name_.capture_api_type() == Name::AVFOUNDATION)
     LogMessage("Using AVFoundation for device: " + device_name_.name());
@@ skipping 190 matching lines @@
   if (![capture_device_ setCaptureHeight:capture_format_.frame_size.height()
                                    width:capture_format_.frame_size.width()
                                frameRate:capture_format_.frame_rate]) {
     ReceiveError("Could not configure capture device.");
     return false;
   }
   return true;
 }
 
 } // namespace media