Remove software paint FrameSubscriber from tab capture.

content/browser/media/capture/video_capture_oracle.cc

 // Copyright (c) 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.
 
 #include "content/browser/media/capture/video_capture_oracle.h"
 
 #include <algorithm>
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
@@ skipping 72 matching lines @@
   if (event_time < last_event_time_[event]) {
     LOG(WARNING) << "Event time is not monotonically non-decreasing.  "
                  << "Deciding not to capture this frame.";
     return false;
   }
   last_event_time_[event] = event_time;
 
   bool should_sample;
   switch (event) {
     case kCompositorUpdate:
-    case kSoftwarePaint:
       smoothing_sampler_.ConsiderPresentationEvent(event_time);
       content_sampler_.ConsiderPresentationEvent(damage_rect, event_time);
       if (content_sampler_.HasProposal()) {
         should_sample = content_sampler_.ShouldSample();
         if (should_sample)
           event_time = content_sampler_.frame_timestamp();
       } else {
         should_sample = smoothing_sampler_.ShouldSample();
       }
       break;
@@ skipping 314 matching lines @@
   if (borrowed_time_ >= min_capture_period_) {
     borrowed_time_ -= min_capture_period_;
     frame_timestamp_ = base::TimeTicks();
   } else {
     sequence_offset_ += advancement;
     frame_timestamp_ = timebase + sequence_offset_;
   }
 }
 
 }  // namespace content