Change rtc::TimeNanos and rtc::TimeMicros return value from uint64_t to int64_t.

webrtc/modules/video_coding/codecs/test/videoprocessor.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 367 matching lines @@
     bool write_success = frame_writer_->WriteFrame(image_buffer.get());
     RTC_DCHECK(write_success);
     if (!write_success) {
       fprintf(stderr, "Failed to write frame %d to disk!", frame_number);
     }
   }
 }
 
 int VideoProcessorImpl::GetElapsedTimeMicroseconds(int64_t start,
                                                    int64_t stop) {
-  uint64_t encode_time = (stop - start) / rtc::kNumNanosecsPerMicrosec;
-  RTC_DCHECK_LT(encode_time,
-                static_cast<unsigned int>(std::numeric_limits<int>::max()));
+  int64_t encode_time = (stop - start) / rtc::kNumNanosecsPerMicrosec;
+  RTC_DCHECK_GE(encode_time, std::numeric_limits<int>::min());
+  RTC_DCHECK_LE(encode_time, std::numeric_limits<int>::max());
   return static_cast<int>(encode_time);
 }
 
 const char* ExcludeFrameTypesToStr(ExcludeFrameTypes e) {
   switch (e) {
     case kExcludeOnlyFirstKeyFrame:
       return "ExcludeOnlyFirstKeyFrame";
     case kExcludeAllKeyFrames:
       return "ExcludeAllKeyFrames";
     default:
@@ skipping 17 matching lines @@
 }
 int32_t VideoProcessorImpl::VideoProcessorDecodeCompleteCallback::Decoded(
     VideoFrame& image) {
   // Forward to parent class.
   video_processor_->FrameDecoded(image);
   return 0;
 }
 
 }  // namespace test
 }  // namespace webrtc