Mac Video Capture: correct to float the erroneous handling of frame rate as int.

media/video/capture/mac/video_capture_device_avfoundation_mac.mm

 // 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.
 
 #import "media/video/capture/mac/video_capture_device_avfoundation_mac.h"
 
 #import <CoreVideo/CoreVideo.h>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 153 matching lines @@
     return NO;
   }
   [captureVideoDataOutput_
       setSampleBufferDelegate:self
                         queue:dispatch_get_global_queue(
                             DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)];
   [captureSession_ addOutput:captureVideoDataOutput_];
   return YES;
 }
 
-- (BOOL)setCaptureHeight:(int)height width:(int)width frameRate:(int)frameRate {
+- (BOOL)setCaptureHeight:(int)height
+                   width:(int)width
+               frameRate:(float)frameRate {
   // Check if either of VideoCaptureDeviceMac::AllocateAndStart() or
   // VideoCaptureDeviceMac::ReceiveFrame() is calling here, depending on the
   // running state. VCDM::ReceiveFrame() calls here to change aspect ratio.
   DCHECK((![captureSession_ isRunning] &&
       main_thread_checker_.CalledOnValidThread()) ||
       callback_thread_checker_.CalledOnValidThread());
 
   frameWidth_ = width;
   frameHeight_ = height;
   frameRate_ = frameRate;
@@ skipping 16 matching lines @@
   CrAVCaptureConnection* captureConnection = [captureVideoDataOutput_
       connectionWithMediaType:AVFoundationGlue::AVMediaTypeVideo()];
   // Check selector existence, related to bugs http://crbug.com/327532 and
   // http://crbug.com/328096.
   // CMTimeMake accepts integer argumenst but |frameRate| is float, round it.
   if ([captureConnection
            respondsToSelector:@selector(isVideoMinFrameDurationSupported)] &&
       [captureConnection isVideoMinFrameDurationSupported]) {
     [captureConnection setVideoMinFrameDuration:
         CoreMediaGlue::CMTimeMake(media::kFrameRatePrecision,
-                                  frameRate * media::kFrameRatePrecision)];
+            (int)(frameRate * media::kFrameRatePrecision))];
   }
   if ([captureConnection
            respondsToSelector:@selector(isVideoMaxFrameDurationSupported)] &&
       [captureConnection isVideoMaxFrameDurationSupported]) {
     [captureConnection setVideoMaxFrameDuration:
         CoreMediaGlue::CMTimeMake(media::kFrameRatePrecision,
-                                  frameRate * media::kFrameRatePrecision)];
+            (int)(frameRate * media::kFrameRatePrecision))];
   }
   return YES;
 }
 
 - (BOOL)startCapture {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   if (!captureSession_) {
     DLOG(ERROR) << "Video capture session not initialized.";
     return NO;
   }
@@ skipping 59 matching lines @@
 }
 
 - (void)sendErrorString:(NSString*)error {
   DLOG(ERROR) << [error UTF8String];
   base::AutoLock lock(lock_);
   if (frameReceiver_)
     frameReceiver_->ReceiveError([error UTF8String]);
 }
 
 @end