"Buttery Smooth" Tab Capture.

content/browser/renderer_host/media/video_capture_buffer_pool.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/renderer_host/media/video_capture_buffer_pool.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stl_util.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
 
 namespace content {
 
 const int VideoCaptureBufferPool::kInvalidId = -1;
 
 VideoCaptureBufferPool::VideoCaptureBufferPool(int count)
     : count_(count),
       next_buffer_id_(0) {
+  DCHECK_GT(count, 0);
 }
 
 VideoCaptureBufferPool::~VideoCaptureBufferPool() {
   STLDeleteValues(&buffers_);
 }
 
 base::SharedMemoryHandle VideoCaptureBufferPool::ShareToProcess(
     int buffer_id,
     base::ProcessHandle process_handle,
     size_t* memory_size) {
@@ skipping 129 matching lines @@
 
 VideoCaptureBufferPool::Buffer* VideoCaptureBufferPool::GetBuffer(
     int buffer_id) {
   BufferMap::iterator it = buffers_.find(buffer_id);
   if (it == buffers_.end())
     return NULL;
   return it->second;
 }
 
 }  // namespace content
-